Travel Vietnam eSIM | Viettel, Vinaphone & Mobifone

A Vietnam eSIM should follow your itinerary’s shape — 1,600 km north to south — and this guide matches Viettel’s provincial dominance and Vinaphone’s 5G to the route you will run. Vietnam is a north–south country: more than 1,600 km from Sapa’s border peaks to the Mekong Delta, with your itinerary almost certainly touching both ends. That shape decides your eSIM more than any brand loyalty. On Ookla’s 1H 2025 Speedtest data, Viettel was the Best Mobile Network in the country with a median download of 165.03 Mbps and a consistency score of 97.4%, and it was the fastest provider in 59 of Vietnam’s 63 provinces. Vinaphone runs the fastest 5G network (median 5G download 594.16 Mbps), while Mobifone posted the best mobile video experience (74.46). Since all three switched on commercial 5G between October 2024 and June 2025 — with coverage reaching 91.2% of the population by December 2025 — the real question is not “is there 5G in Vietnam?” but “which carrier holds signal along the specific 1,600 km you are traveling?”

Quick answer: Viettel is the network most visitors should shortlist first in Vietnam; Vinaphone is the value alternative to price against it. If you would sooner test than read, Roami’s trial eSIM is the cost-free way to start in Vietnam.

If you have never installed a profile — or you are unsure whether your phone supports one — those two gaps are covered elsewhere: the phone compatibility list and the activation explainer. That leaves this page free to stay on the networks.

The 30-second version: Traveling the full length of the country, including mountains, islands or the Mekong Delta? Viettel — it wins nearly every province in the Ookla data, including remote Lào Cai (Sapa), Hà Giang and Cà Mau. Staying in Hanoi, Da Nang or Ho Chi Minh City with a 5G phone? Vinaphone gives you the fastest 5G in Vietnam where it is deployed. Beach-heavy central Vietnam (Hue, Da Nang, Nha Trang)? Viettel again — those are the fastest cities in the country. Buying direct from a carrier is possible for tourists: Viettel sells a passport-registered tourist eSIM from 60,000 VND (about USD 2.40) at airport counters. Or skip the passport photocopying entirely: free eSIM trial works the moment you land, and Vietnam eSIM plans are delivered by QR code in minutes.

Which Vietnam carriers will host your eSIM

Vietnam’s mobile market is a three-player state-owned system, and it is one of the most lopsided in the world. Viettel, owned by the Ministry of National Defense, held roughly 56% of mobile subscriptions, Vinaphone (VNPT) around 21%, and Mobifone — which passed to the Ministry of Public Security in 2025 — roughly 18%. GSMA Intelligence counted about 79 million connections on Viettel against 25 million on Vinaphone at end-2025. A handful of small MVNOs (Vietnamobile, GMobile) exist but hold minimal spectrum and share; visitors should treat the big three as the whole market.

	Viettel	Vinaphone (VNPT)	Mobifone
Market position	Largest carrier; ~56% share; best rural footprint	Second network; ~21% share; strongest in cities	Third network; ~18% share; urban-focused
Ookla 1H 2025 headline	Best Mobile Network — 165.03 Mbps median download, 97.4% consistency, 50.4% 5G availability	Fastest 5G — 594.16 Mbps median 5G download, 30 ms 5G latency	Best mobile video experience — 74.46 Video Streaming Score
Median 5G download	421.61 Mbps	594.16 Mbps	306.5 Mbps
eSIM for visitors	Yes — tourist eSIM at airports and stores, passport registration	Yes — tourist eSIM via carriers and resellers, passport registration	Yes — eSIM sold direct, passport registration applies
Best for	The full north–south route, mountains, rural areas	Speed in big cities on a 5G phone	City stays and video streaming

The practical asymmetry: Viettel wins almost everywhere, but Vinaphone’s 5G is faster where Vinaphone has deployed it. A travel eSIM that can select between networks captures both benefits — and the Vietnam eSIM plans page explains how automatic network selection works.

Which carrier should I choose for Vietnam?

The table above is a summary. The three networks earned their positions in different ways, and each one is the right answer to a different itinerary.

Viettel vs Vinaphone: which is better in Vietnam?

Viettel is the state-defence operator, and its advantage is geography rather than peak speed. It took Best Mobile Network, Fastest Mobile Network, Most Consistent Network and Best 5G Availability in Ookla’s 1H 2025 Vietnam report in the same collection period.

• Measured position: median download of 165.03 Mbps across all technologies, against 78.69 Mbps for Vinaphone and 68.45 Mbps for Mobifone. Consistency of 97.4% — the share of samples clearing a 5 Mbps down / 1 Mbps up threshold. Speedtest Connectivity Score of 83.17.

• Where it wins: fastest provider in 59 of 63 regions and nine of the ten most populous cities, across the whole spine of the country — Lào Cai at 85.92 Mbps, Hà Giang at 85.88 Mbps and Cà Mau at 139.66 Mbps.

• 5G: first to launch commercial 5G, on 15 October 2024, and its provincial build-out stays ahead of the other two carriers — the base-station and user numbers are detailed in the 5G section below.

• What goes wrong: the strongest network still hands out the weakest 5G experience in the tourist package range — 50.4% 5G availability means roughly half your time on Viettel is spent on 4G, which in Vietnam is genuinely fast but not what the sticker promises.

• Scenario: the Hà Giang loop. Hà Giang province measured 85.88 Mbps with Viettel as the fastest provider, which covers the towns and the main viewpoints on the loop. The high mountain passes between Đồng Văn and Mèo Vạc are where the bars disappear, so download offline maps before you leave Hà Giang city.

Viettel vs Vinaphone 5G: which is better in Vietnam?

VNPT’s mobile arm is the second network and the one that measures fastest on 5G. It won Fastest 5G Network in Ookla’s 1H 2025 Vietnam report, and took Ookla’s Best 5G Network award for Southeast Asia in 2H 2025 — ahead of Singtel, Unifi and AIS — judged on Speedtest Connectivity Score.

• Measured position: median 5G download of 594.16 Mbps, median 5G upload of 55.37 Mbps and 30 ms latency over 5G. Speedtest users also rated it the top provider in Vietnam, at 4.08 out of 5.

• Where it wins: dense urban cells and tourist zones. Vinaphone switched on commercial 5G in December 2024 and prioritised administrative centres, industrial parks, airports, seaports and tourism areas — which is close to a map of where visitors actually spend their days.

• Where it loses: the same Ookla period put its all-technology median download at 78.69 Mbps, less than half Viettel’s, and Viettel was the fastest provider in 59 of 63 regions. Vinaphone’s 5G lead evaporates the moment you leave the 5G footprint.

• What goes wrong: tourists buy Vinaphone for a mountain trip and discover the 5G they paid for is a city product. If your route is a loop rather than a stay, this is the wrong network.

• Scenario: Hanoi. The city recorded a 119.52 Mbps median mobile download, and Vinaphone’s 5G covers the central districts and Nội Bài. Inside the Old Quarter the constraint is congestion from narrow streets packed with users, not distance to a mast — a slower speedtest there is network loading, not a fault.

Rural coverage in Vietnam: Viettel vs Vinaphone

Mobifone is the third operator and the last to launch 5G, switching on commercial service on 23 June 2025 — eight months after Viettel. It concentrates on major urban centres, which is exactly where its strength shows.

• Measured position: the best mobile video experience in Vietnam, a Video Streaming Score of 74.46, plus a median 5G download of 306.5 Mbps and an all-technology median of 68.45 Mbps.

• Where it wins: streaming. If your evenings are spent on hotel Wi-Fi-free video, Mobifone’s video score is the highest of the three, and Da Nang — 354.94 Mbps in Ookla’s city table and the strongest beach-city network in the country — is where it has the most headroom.

• Where it loses: everything outside the cities. As the smallest of the three it has the least rural fallback, so the Mekong Delta, the far north and the islands are Viettel’s ground.

• What goes wrong: the “Happy Tourist” plans are cheap and the registration is the same passport process as everyone else’s, so the savings are real; the risk is coverage, not paperwork.

• Scenario: Hội An. Quảng Nam province measured 169.24 Mbps with Viettel fastest, and the old town and beach strip are well covered on all three. Mobifone is a reasonable choice for a Hội An-and-Da Nang stay; it is not a reasonable choice for the ride between them and the delta.

The local carriers: Viettel, Vinaphone and Mobifone

Ookla names one winner per award category and leaves the rest unpublished. The table below reports every carrier-level figure in the 1H 2025 Vietnam report; a blank means Ookla did not publish that carrier’s number, not that it is zero.

Ookla metric, 1H 2025	Viettel	Vinaphone	Mobifone
Median download, all technologies	165.03 Mbps	78.69 Mbps	68.45 Mbps
Median upload, all technologies	34.2 Mbps	—	—
Latency, all technologies	34 ms	—	—
Speed Score (fastest mobile network)	82.56	—	—
Speedtest Connectivity Score	83.17	—	—
Median 5G download	421.61 Mbps	594.16 Mbps	306.5 Mbps
Median 5G upload	—	55.37 Mbps	—
Latency over 5G	—	30 ms	—
Speed Score, 5G	—	78.11	—
Speedtest 5G Connectivity Score	81.53	—	—
5G availability	50.4%	—	—
Consistency (5 Mbps down / 1 Mbps up)	97.4%	—	—
Video Streaming Score	—	—	74.46
Game Score	79.81	—	—
Speedtest 5-star rating	—	4.08 / 5	—

Two things in that table matter more than the single winners. First, Ookla publishes the spread as well as the leader, and the spreads are narrow: consistency ranged from 95% to 97.4% across the three carriers, video from 68.29 to 74.46, and Speedtest Connectivity Score from 73.82 to 83.17. Even the weakest Vietnamese carrier cleared a 95% consistency threshold — that is why a travel eSIM that hops between them is a safe design in this market. Second, 5G availability ranged from 10.4% to 50.4%, which means the gap between the best and worst 5G experience in Vietnam is roughly five times, and it is entirely a question of where you are standing.

For a second view, Vietnam’s own Internet Centre (i-Speed) measured Q2 2025 mobile averages of 83.6 Mbps on Viettel, 70.71 Mbps on VNPT and 52.47 Mbps on MobiFone — a different methodology producing the same ranking.

5G nationwide: Viettel, Vinaphone and Mobifone 5G coverage compared

Vietnam moved from pilot projects to full commercial 5G in under a year, and the sequence matters for travelers:

• 15 October 2024 — Viettel became the first operator to launch commercial 5G, and within weeks claimed 5G in the centers of all 63 provinces and cities.

• December 2024 — VNPT switched on Vinaphone’s commercial 5G, prioritizing administrative centers, industrial parks, airports, seaports and tourist zones.

• 23 June 2025 — Mobifone entered the market, initially concentrating on major urban centers.

• By December 2025 — the Ministry of Science and Technology reported commercial 5G coverage at 91.2% of the population, one of the fastest national rollouts on record.

Two caveats keep expectations honest. First, “coverage of provincial centers” is not the same as coverage of rural roads — in early 2025 Viettel operated about 6,500 5G base stations against a far larger 4G estate, so outside cities you will mostly ride 4G, which in Vietnam is very good. Second, Ookla’s 1H 2025 data shows Viettel users spent a majority of time on 5G only 50.4% of the time — plenty of 4G fallback even in the launch year.

The build-out has not stood still since. By November 2025 Viettel had completed roughly 7,000 5G base stations across all 34 provinces and cities, with a stated target of more than 20,000 by the end of that year and 99% population coverage by 2030; it reports 12.6 million active 5G users, the largest 5G base in the country. For a traveler, the summary is simple: 5G in the cities and tourist hubs on all three carriers, excellent 4G everywhere else, and Viettel’s 5G footprint ahead of the other two in the provinces.

How do you buy a local eSIM as a tourist?

Every SIM in Vietnam — physical or eSIM — must be registered to a verified identity. That rule comes from Decree 49/2017/ND-CP and subsequent cybersecurity regulations, and it is enforced, not optional: since 2018 carriers have been required to deactivate unregistered numbers. For a foreign visitor, this means your physical passport — copies and phone photos are not accepted — plus, for self-service eSIM registration, a live selfie matched to your passport page.

Can you buy a Vietnam eSIM from Viettel?

Viettel has the most tourist-friendly eSIM path of the three. Official red-and-white Viettel counters sit in the arrivals halls of Noi Bai (Hanoi), Tan Son Nhat (Ho Chi Minh City), Da Nang and Cam Ranh (Nha Trang) airports, and in Viettel stores nationwide. Published tourist eSIM packages include:

Plan	Validity	Data	Price
5G60T	7 days	5 GB/day	60,000 VND (≈ USD 2.40)
5G80T	15 days	5 GB/day	80,000 VND (≈ USD 3.20)
5G150T	30 days	5 GB/day	150,000 VND (≈ USD 6)

Registration works one of two ways: the counter staff photocopy your passport and register the line for you (5–15 minutes), or you self-register by scanning the QR code on the SIM packaging, photographing your passport and taking a live selfie, then electronically signing the digital contract. Viettel tourist eSIMs come with a real Vietnamese phone number, so you can receive SMS verification codes — genuinely useful, since Grab, food delivery and many hotel bookings are phone-number-driven in Vietnam.

The Vietnam SIM counter visit, step by step

The airport route is the one most visitors take, so it is worth knowing the sequence before you join it:

1. Find the Viettel booth in the arrivals hall — Noi Bai, Tan Son Nhat, Da Nang or Cam Ranh. Red-and-white branding, staff in uniform, a queue.

2. Hand over your physical passport. Photocopies, screenshots and photos on your phone are refused; this is the whole point of Decree 49/2017.

3. Choose a tier from the table above. The 15-day 5G80T carries 5 GB per day, so it is 75 GB across the trip for 80,000 VND — the arithmetic is the appeal, not the headline price.

4. The staff register the line against your passport and issue an eSIM QR code, or a physical SIM if your phone is not eSIM-capable.

5. Scan the QR while you are still in the terminal, using the airport’s Wi-Fi if your home roaming is already off.

6. Keep the receipt and the SIM packaging. If the line dies in the next two days you will need both to prove when and where it was registered.

Budget 5–15 minutes if the queue is short, and considerably longer when two or three wide-body arrivals land together in the late morning.

Is my phone eSIM-compatible in Vietnam?

Vinaphone sells tourist SIMs and eSIMs through its airport counters and authorized resellers, typically from around 200,000 VND for multi-week packages with daily data allowances plus on-network calling. Mobifone’s tourist products (“Happy Tourist” plans) sit in a similar range, roughly 220,000–280,000 VND for 30 days. All three carriers now sell eSIMs through their websites and apps, but international travelers are still routed through identity verification — some online purchases require completing verification at a store or kiosk after arrival.

The reseller layer — airport kiosks, city phone shops, guesthouse front desks — sells the same three networks, and it does not remove the paperwork. Someone still has to photograph your passport and complete the registration, because the carrier is legally liable for the line. This is why a reseller eSIM promising “registration included, no passport” is the single most likely product in Vietnam to go dead on day two.

Vietnam SIM registration: Decree 49/2017 in practice

The regulation is easy to state and easy to underestimate. Three things follow from it that affect an ordinary two-week trip:

• You will hand over your passport, not a copy. Counter staff photocopy it, or the eSIM self-registration flow photographs the data page and takes a live selfie that is matched to it.

• A failed registration is invisible at first. The line activates, works for the evening, and is deactivated within 24–48 hours once the registration check fails — typically because a passport photo came back blurry, a name did not transcribe cleanly, or a street seller never submitted the paperwork at all.

• The fix is at the counter, not on your phone. If a local SIM stops working after a day and the phone still shows bars, the registration did not complete. Return to the issuing counter with your passport and the packaging rather than resetting network settings.

What a travel eSIM lets you skip

A data-only travel eSIM sidesteps the entire local registration chain, which is a bigger practical saving than the price difference:

• No passport handover, no photocopy, no live selfie.

• No arrival-hall queue, and no dependence on a counter being open when your flight lands.

• No 24–48 hour deactivation risk from an incomplete registration.

• Nothing to top up, and no Vietnamese phone number to look after.

What it does not give you is a Vietnamese number, which matters for exactly two things: SMS verification on some local banking and Zalo flows, and receiving calls from hotels and drivers. Keep your home SIM active for SMS and put data on the eSIM — the setup is described below.

Vietnam: the carrier lineup

	Direct from a Vietnamese carrier	Travel eSIM
What you need	Physical passport, in-person or selfie verification	A compatible, unlocked phone
What you get	Vietnamese phone number, voice calls and SMS, cheap domestic data	Data only, delivered instantly by QR code
Typical cost	60,000–150,000 VND for tourist tiers	Comparable per-GB for short trips; pricier per GB on paper, faster to obtain
Best for	Stays over 2–3 weeks, needing local number for Grab/banks	Trips under two weeks, multi-country itineraries, want it working before landing

Cable.co.uk’s global survey prices Vietnamese mobile data at about USD 0.29 per gigabyte — 21st cheapest of 237 markets against a USD 2.59 world average — so local plans are astonishingly cheap by Western standards. The direct-carrier route costs you a passport handover and possibly a queue, not money. A travel eSIM costs slightly more per gigabyte and saves you the paperwork; for most one-to-two-week visits that trade is worth it. One planning note: if Vietnam is one stop on a wider trip, the Thailand eSIM guide, Cambodia eSIM guide and China eSIM guide cover the neighboring networks, and a regional profile avoids installing a new eSIM at every border.

Best Vietnam eSIM carrier for your trip: Viettel vs Vinaphone

Carrier choice in Vietnam is an itinerary decision, not a preference. Match the row to your route:

Your trip	Best pick	Why	Watch out for
Hanoi to Ho Chi Minh City overland, 10–15 days	Viettel	Fastest in 59 of 63 regions; 97.4% consistency, the highest in the country	Even on Viettel you are on 5G only about half the time — the rest is 4G
City break in Hanoi or Ho Chi Minh City with a 5G phone	Vinaphone	Median 5G download of 594.16 Mbps, the fastest 5G in Vietnam	Step outside the 5G footprint and its all-technology median is less than half Viettel’s
Central coast beach stay — Da Nang, Hội An, Nha Trang	Viettel	Three of the fastest cities in Ookla’s table sit on this coast	Typhoons between mid-September and mid-November close airports and cut power
Far north — Hà Giang loop, Sapa, Lào Cai	Viettel	Fastest provider in both Hà Giang and Lào Cai regions	Long gaps on the extreme passes; the carrier cannot fix a mountain
Mekong Delta and the southern islands — Phú Quốc, Côn Đảo	Viettel	Fastest in Kiên Giang and An Giang regions, with 96.6% consistency in An Giang	Province figures flatter the beaches; anchorages and small islands are thinner
Streaming, downloads, hotels with slow Wi-Fi	Mobifone	Best Video Streaming Score in Vietnam at 74.46	Smallest rural footprint of the three
Long stay or workation	A local Viettel line plus a travel eSIM for the first days	A Vietnamese number covers Grab, deliveries and SMS verification	Local registration needs your passport; a data-only eSIM cannot receive SMS
Cross-border itinerary across Southeast Asia	A regional or multi-country plan	A Vietnam-only profile stops working at the border	Your e-visa must be multiple-entry if you come back in
Budget traveler	Vinaphone reseller packages or Mobifone Happy Tourist	Multi-week tourist tiers from around 200,000 VND, below the Viettel airport tiers	Cheap lines from unregistered sellers get cut within 48 hours

Will your phone work on a Vietnamese network?

Vietnamese 4G networks use LTE bands 1, 3, 5, 7, 8, 28, 40 and 41; 5G deployments center on n78 (3.5 GHz), with n28 (700 MHz) and n41 (2.6 GHz) also in use. Any mainstream smartphone sold in the last five years — iPhone XS and later, Pixel 3 and later, Samsung Galaxy S20 and later — covers these bands. The trap to check is not bands but two simpler things:

• Carrier lock. A phone locked to your home carrier will install the eSIM profile but refuse to connect to Viettel, Vinaphone or anyone else. Check at Settings → General → About → Carrier Lock (iPhone) or ask your home carrier; get it unlocked before you fly.

• eSIM support. Dial *#06# — if an EID appears, your phone has an eSIM. Mainland-China iPhone models have eSIM hardware disabled and cannot use any eSIM.

Vietnam’s carriers switched off 2G and 3G, so voice calls run over VoLTE — enable VoLTE for your eSIM line if the option exists. For the model-by-model list, the eSIM device checker settles it in one check.

Do I need to change the APN on my Vietnam eSIM?

If you buy from a carrier directly and data refuses to flow despite full signal bars, a manual APN is the fix. These are the settings in use on Vietnam’s networks:

Carrier	APN	Username	Password
Viettel	v-internet	blank	blank
Vinaphone	m3-world	mms	mms
Mobifone	m-wap	mms	mms

Enter them at iPhone: Settings → Cellular → your eSIM line → Cellular Data Network, or Android: Settings → Connections → Mobile Networks → Access Point Names. On Android, set the APN type to default,supl,dun — the dun entry is what makes the personal hotspot work on some handsets. Save, then toggle airplane mode once to force the phone to re-register.

If you are on a travel eSIM, do not touch any of this: the profile carries its own provisioning, and editing it will break the connection. The only common exception is a carrier-issued eSIM whose automatic configuration did not run because the registration was still pending — which is the same failure that kills the line 24–48 hours later, so check the registration before you start editing APN fields.

How to activate a Vietnam eSIM

Install the profile before you fly. Airport Wi-Fi in Hanoi and Ho Chi Minh City works, but you do not want to be troubleshooting a QR code while the arrivals hall crowd does the same thing. The full install sequence — scan the QR code, label the line, set it as your data line, enable data roaming — is in the eSIM setup guide. Three Vietnam-specific points:

1. Data roaming must be ON for the eSIM line. Travel eSIMs roam onto the local network by design; turning roaming off kills the connection while your home SIM stays safe because data routing points at the eSIM.

2. Check the data line, not just the signal. With dual SIM active, Vietnam eSIM users’ most common failure is the phone silently sending traffic over the home SIM. Settings → Cellular → Mobile Data → select the eSIM.

3. A line that dies on day two usually means registration failed. If a carrier-bought SIM stops working after 24–48 hours, the passport registration did not complete — return to the counter where you bought it rather than troubleshooting the phone.

Adding a Vietnam eSIM to your device

#	Check	What good looks like
1	Phone is not carrier-locked	Carrier Lock in Settings → General → About says “No SIM restrictions”
2	Phone is eSIM-capable	*#06# returns an EID, or the checker confirms your model
3	QR code and activation code saved twice	A screenshot on the phone and a copy in cloud storage
4	Profile installed before you fly	Installed on home Wi-Fi; the line registers when you land
5	eSIM set as the data line, roaming on	Settings → Cellular → Mobile Data → your eSIM, with data roaming enabled
6	APN left untouched	Only edited if you bought from a carrier and have bars but no data

Which Vietnam carrier should you pick: Viettel vs Vinaphone?

• Viettel — an eSIM QR from an airport counter or store, or from the self-registration flow; the line carries a Vietnamese number.

• Vinaphone — QR or eSIM through airport counters, authorized resellers and the VNPT app; confirm with the seller that registration was submitted, or expect a cut within 48 hours.

• Mobifone — Happy Tourist eSIM sold direct and through resellers; the passport process is identical to the other two.

• Travel eSIM — QR delivered by email within minutes of checkout, no local registration, and the profile roams onto whichever of the three networks is strongest where you stand.

Five Vietnam eSIM failure patterns and how to clear them

A. The profile will not download

1. Re-scan on a stable Wi-Fi network, not on a moving bus.

2. Confirm the QR has not already been scanned — most are single-use.

3. Confirm the phone is unlocked and that the vendor’s activation window has not expired.

B. Installed, but no bars at all

1. Check that the Vietnam profile is enabled in Settings → Cellular.

2. Settings → Cellular → Network Selection → pick Viettel, Vinaphone or Mobifone manually instead of automatic.

3. Reboot, then reset network settings if the bars stay empty.

C. Bars, but no internet

1. Check the APN against the table above — v-internet on Viettel, m3-world on Vinaphone, m-wap on Mobifone.

2. Confirm the eSIM, not your home SIM, is the selected data line.

3. On a carrier plan, check the daily allowance has not already run out.

D. “SOS” or “No Service” only

1. Disable the other SIM or eSIM temporarily so the phone stops trying to camp on the wrong network.

2. Re-check that data roaming is on for the eSIM line.

3. Network settings reset, power-cycle, then test again.

4. As a last resort, delete the profile and reinstall from a fresh QR code.

E. It worked yesterday and died today

1. This is almost always a failed passport registration, not a phone fault. Look at the phone first: if bars are present but no data flows, the line itself has been suspended.

2. Return to the counter that issued it with your passport and the SIM packaging.

3. If you bought a reseller eSIM, ask the seller directly whether the registration was submitted — and be ready to switch to a pre-installed travel plan.

Everything else sits in the eSIM problem-solving guide: a profile that will not download, a scan that keeps failing, or a line that installs but never registers.

Vietnam eSIM support: checks to run first

Information	Where to find it
Order or account reference	Confirmation email
EID	*#06#
Phone model and OS version	Settings → About
Screenshot of the error	Take it before the screen changes
Current APN values	Settings → Cellular Data Network
Data roaming status	Settings → Cellular → your eSIM line
Steps already tried	Keep a short written list

Where does a Vietnam eSIM actually hold signal, north to south?

Vietnam’s network performance follows its coastline — and the Ookla regional data is unusually detailed about exactly where the fast and slow stretches sit. All figures are median mobile downloads, 1H 2025:

Your stop	Median mobile download	Reality on the ground
Sapa (Lào Cai)	85.92 Mbps	Solid in town and on the main ridge viewpoints; the outlying village trails thin out. Viettel is the fastest provider.
Ha Giang	85.88 Mbps	Coverage through the loop’s towns; long gaps on the extreme passes. Download offline maps.
Ha Long Bay (Quảng Ninh)	70.97 Mbps	Good in Ha Long City and on major cruise routes; the bay’s remoter anchorages drop to 4G or nothing.
Ninh Binh (Ninh Bình)	68.24 Mbps	Among the slower northern regions on Ookla’s table, but 95.5% consistency — Tam Cốc and the Tràng An boat docks are fine, and the surrounding karst roads are 4G.
Hanoi	119.52 Mbps	Reliable citywide; the Old Quarter’s narrow streets create localized congestion, not dead zones.
Hue (Thừa Thiên Huế)	613.79 Mbps	The fastest city in Vietnam in Ookla’s data.
Da Nang	354.94 Mbps	Fast and consistent — the strongest beach-city network in the country, including the Hai Van Pass approach.
Hoi An (Quảng Nam)	169.24 Mbps	Well covered through the old town and beach strip.
Nha Trang	443.19 Mbps	Strong through the resort corridor; patchier on coastal drives south.
Da Lat	536.58 Mbps	Vietnam’s second-fastest city — better than most visitors expect.
Ho Chi Minh City	117.89 Mbps	The slowest of Vietnam’s big cities in Ookla’s data — dense demand, still fully usable.
Can Tho / Mekong Delta	149.43 Mbps	Good in provincial capitals; the outer river branches and floating markets depend on Viettel.
Chau Doc (An Giang)	100.5 Mbps	An Giang region reached 100.5 Mbps at 96.6% consistency — across the delta, consistency counts for more than headline speed.
Phu Quoc (Kiên Giang)	98.76 Mbps	Kiên Giang region measured 98.76 Mbps with Viettel fastest; resort strips and the cable‑car area are fine, the smaller islets are not.
Con Dao (Bà Rịa–Vũng Tàu)	95.72 Mbps	Bà Rịa–Vũng Tàu region hit 95.72 Mbps at 96% consistency. Côn Đảo town is covered; the national park trails and the outer coves are not.

Two takeaways from that table. First, Viettel was the fastest provider in nine of the ten measured cities and 59 of 63 regions — if you buy a single-carrier eSIM in Vietnam, Viettel is the safest choice by a distance. Second, the cities most international visitors assume are slowest (Hanoi, Ho Chi Minh City) are merely “slow” at a level — roughly 118 Mbps — that most countries would envy. The national median across all networks was 219.93 Mbps, ranking Vietnam 9th in Ookla’s Speedtest Global Index as of August 2026, with 19 ms latency.

One reading note: the city rows in that table (Hue, Da Nang, Nha Trang, Da Lat, Hanoi, Ho Chi Minh City) are Ookla’s most-populous-city measurements, while the provincial rows (Lào Cai, Hà Giang, Quảng Ninh, Ninh Bình, Kiên Giang, An Giang, Bà Rịa–Vũng Tàu) are region-level. A province figure averages its capital, its highways and its empty coast, so treat the island and delta rows as “what the whole province measured”, not as a promise for a specific beach.

Which carrier leads 5G in Vietnam?

All three carriers launched commercial 5G inside the same 12-month window, so the question on any given leg is not whether 5G exists but whether you are standing in a place the rollout prioritised — provincial centres, airports, seaports, industrial parks and designated tourist zones.

Leg	5G reality	What to do about it
Hanoi, Da Nang, Ho Chi Minh City	Widest 5G footprint; Vinaphone measured fastest here	Use a 5G handset if you have one — this is where it pays
Airport arrivals (Nội Bài, Tân Sơn Nhất, Đà Nẵng, Cam Ranh)	5G at all four; registration counters in the same halls	Install and register before you leave the terminal
Ha Long City and the cruise port	5G in the city; the bay itself thins by anchorage	Download maps and boat timetables at the pier, not at sea
Sapa, Hà Giang, Ninh Bình, the northern karst	Mostly 4G, which measures 68–86 Mbps in these provinces	Buy for coverage, not for 5G, in the north
Hue, Hội An, Nha Trang, Da Lat	5G in the urban cores with 4G on the approaches	The central coast has the best mix of speed and reliability in the country
Mekong Delta and the southern islands	5G limited to town centres; river and island edges are 4G	Viettel is the safest single choice across the delta and the islands

The country-level market context, from DataReportal’s 2025 figures: 79.8 million internet users (78.8% of the population) and about 127 million mobile connections — 126% of the population, so most Vietnamese carry multiple SIMs. That density of usage is why urban cells congest at peak hours even when headline speeds are world-class.

Vietnam coverage on trains, sleeper buses and the Hai Van Pass

Vietnam is 1,600 km long and the way you move through it decides how much of the trip you spend with signal. The three north–south modes behave differently.

The North–South railway. The Reunification Express — locally the Thống Nhất — runs the 1,726 km between Hanoi and Saigon, with end-to-end trips of 32 to 36 hours depending on service. The SE1/SE2 and SE3/SE4 pairs are the newest rolling stock; odd numbers run southbound, even numbers northbound. Soft sleeper (four berths per cabin) costs roughly 1,750,000–2,400,000 VND, hard sleeper (six berths) about 1,300,000–1,650,000 VND, and a soft seat around 950,000–1,200,000 VND for the full run. There is no on-board Wi-Fi, which is precisely why a working eSIM matters more on the train than in any hotel.

Rail signal is good in the populated stretches and absent in the terrain between them. The dead zones are the tunnels and the sparse corridor between Đồng Hới and Quảng Ngãi, plus the mountain tunnels north of Hue. Buy a berth, keep the phone charged, and expect two or three multi-minute gaps over a full day of travel rather than continuous coverage.

Sleeper buses. Open-tour and sleeper buses cover the same corridor for less — a Hanoi–Ho Chi Minh City sleeper runs roughly 600,000–1,200,000 VND, with operators including Futabus and Hoang Long. Buses follow National Route 1 and the Hồ Chí Minh Road rather than the rail alignment, so coverage tracks the highway towns. The gaps are the mountain passes, the Hồ Chí Minh Road’s western branch through the Central Highlands, and the tunnels on the expressway sections. Overnight departures mean you sleep through the worst of the dead zones anyway.

The Hai Van Pass. The 21 km pass climbs to 496 metres on National Route 1 between Da Nang and Hue, and since 2005 most traffic has bypassed it through the 6.28 km Hai Van Tunnel, which cuts 20 km and 30–60 minutes off the drive. Motorcycles are not permitted inside the tunnel, so anyone on two wheels takes the pass road, with its bends, gradients and fog. On the rail side, the Da Nang–Hue leg takes about 2.5 to 3 hours and is the scenic highlight of the whole line, hugging cliffs above Lang Co Lagoon; heading north from Da Nang, the sea is on your right, and it reverses southbound. The pass road stays open year-round but is frequently fog-bound in rain, and the tunnel is the reliable option when visibility collapses. Coverage tracks the towns at either end rather than the ridge: the 6.28 km tunnel is a gap on every carrier, and the summit climb carries less signal than Da Nang or Hue.

What do I need mobile data for in Vietnam?

Vietnam runs on a handful of apps, and every one of them needs a live data connection at the exact moment you need it. This is the practical argument for arriving connected rather than queueing first.

What you need	The app	Why data matters
Airport transfer and city rides	Grab	Nationwide coverage including small towns, fixed price shown before you book, in-app chat that auto-translates — but the booking fails without data
A quieter, fixed-price car	Xanh SM (listed as Green SM)	Vingroup’s all-electric fleet, launched 2023, now operating across all 34 provinces and cities with a fixed meter and no surge pricing
A cheaper local competitor	Be	Vietnamese-first and best once you have a local number; useful as a fare comparison in the big cities
A metered taxi fallback	Mai Linh and Vinasun apps	Request the real fleet rather than accepting a street solicitation
Food and groceries	GrabFood and ShopeeFood	GrabFood’s cash checkout is the easiest for a foreign card; ShopeeFood’s availability can depend on your app-store region
Messaging with locals	Zalo	Vietnam’s dominant messenger — drivers, guides and homestay hosts use it, and registration needs an SMS code
Navigation	Google Maps, with offline maps downloaded	The offline layer is what keeps you moving through the mountain and delta gaps
Your own paperwork	The e-visa PDF and the pre-arrival form QR	Save both offline; an airport desk that cannot load your visa is a problem you can avoid

Two practical notes. First, Gojek left Vietnam in 2024, so guides that still list it are out of date. Second, Vietnamese QR payments (VietQR) generally require a domestic bank account or a compatible wallet, so for a short stay treat cash as the backup and the ride-hailing app’s card or cash option as the default.

Vietnam data for two weeks: top-ups and USSD codes

Vietnam’s local data is close to free, so the limit on a two-week trip is volume, not price. The arithmetic is simple: Viettel’s tourist tiers all carry 5 GB per day, so the 7-day 5G60T is 35 GB, the 15-day 5G80T is 75 GB, and the 30-day 5G150T is 150 GB. At Cable.co.uk’s USD 0.29 per gigabyte, Vietnamese mobile data is among the cheapest in the world — the full pricing comparison is earlier in this guide.

A travel eSIM usually sells a fixed allowance for the whole trip rather than a daily cap. That makes the choice a sizing question: if your two weeks are maps, ride-hailing, messaging, translation and photo uploads, a single mid-size allowance is comfortable; add daily video streaming or a laptop tethered to the phone and you should size up rather than top up twice mid-trip.

Topping up a Vietnamese local SIM

• Scratch cards — sold at Circle K, FamilyMart, GS25, phone shops and petrol stations, in denominations from 10,000 to 500,000 VND. Scratch the panel, then dial *100*<code># and press call.

• Operator apps — My Viettel, My VNPT and My MobiFone all handle card or linked-wallet top-ups and plan changes.

• E-wallets — MoMo and ZaloPay are the two dominant Vietnamese wallets and can top up all three networks directly.

• Buy early in remote areas. On Côn Đảo, in the Hà Giang passes or on a Mekong river branch there is no shop to walk to, so top up before you leave the last city.

Is 20 GB overkill for Vietnam?

What you want	Viettel	Vinaphone	Mobifone
Check the main balance	*101#	*101#	*101#
Check the data balance	*102#	*102#	*102#
Find your own number	*110# (or *098#)	*110#	*0#
Top up with a scratch card	*100*<code>#	*100*<code>#	*100*<code>#

USSD travels over the carrier’s own signalling channel, so it works with mobile data switched off — and it only works on a line with a Vietnamese number. On a data-only travel eSIM there is nothing to dial, which is why the eSIM app is where you check the remaining allowance instead.

Border crossings and your eSIM

Vietnam has land borders with three countries, and no land border with Thailand at all — a Thai leg means flying, or crossing through Laos or Cambodia first. What matters for your eSIM is that a Vietnam-only profile stops working at the frontier, and what matters for your visa is that the e-visa names the gate you may use.

Crossing	Leads to	What to know about data
Hữu Nghị (Friendship Pass, Lạng Sơn)	China, via rail onward to Nanning	Lạng Sơn region measured 79.42 Mbps, among the slower provinces — expect a visible drop, not a blackout
Lao Cai (Hekou)	China, on the Hanoi–Lao Cai rail line that also serves Sapa	Lào Cai region measured 85.92 Mbps
Móng Cái (Đông Hưng)	China, northeast; onward to Ha Long by road or sea	Quảng Ninh region measured 70.97 Mbps
Lao Bảo	Laos, from Đông Hà and Hue to Savannakhet	Quảng Trị region measured 213.36 Mbps — one of the fastest in the country
Cầu Treo (Keo Nua Pass)	Laos, on the Hanoi–Vientiane bus corridor	Hà Tĩnh region measured 75.54 Mbps
Tây Trang (Điện Biên)	Laos, in the northwest	Điện Biên region measured 87.51 Mbps
Mộc Bài (Bavet)	Cambodia; the HCMC–Phnom Penh bus crossing, 6–8 hours	Tây Ninh region measured 100.06 Mbps
Vĩnh Xương	Cambodia by river boat, about 30 km north of Chau Doc, onward to Phnom Penh	An Giang region measured 100.5 Mbps
Tịnh Biên	Cambodia, about 25 km west of Chau Doc	An Giang region, same 100.5 Mbps figure
Xà Xía (Hà Tiên)	Cambodia’s coast, toward Sihanoukville	Kiên Giang region measured 98.76 Mbps

Three planning points sit on top of that table. First, overland versus by air changes nothing about your eSIM and everything about your timing — air arrivals land at Nội Bài, Tân Sơn Nhất, Đà Nẵng, Cam Ranh and Phú Quốc, where the carrier counters and 5G are; overland arrivals land at a gate where the nearest mast may be kilometres away. Second, nominate the right gate on your e-visa. Vietnam’s e-visa is valid for up to 90 days, single or multiple entry, at USD 25 and USD 50 respectively, and holders must enter and exit through designated international border gates — a land crossing not listed on your visa is not a crossing you can use. Apply at the official Vietnam National e-Visa portal and not through a paid middleman. Third, if your itinerary is Vietnam–Cambodia–Vietnam, choose the multiple-entry option or you will be buying a second visa abroad. For the networks on the other side, see Thailand’s carriers, Cambodia’s crossings and China’s carriers; a regional Southeast Asia plan covers the whole loop with one profile.

Tet, typhoons and network strain in Vietnam

Two calendar events change what a working connection is worth in Vietnam, and both are predictable enough to plan around.

The companies behind Vietnam’s networks

Tet 2027 falls on 6 February 2027, with the public holiday running across the surrounding days; many businesses close before it and reopen after. The railway’s Tet peak runs from 23 January to 25 February 2027 — roughly 300,000 long-distance tickets across 57 train services and more than 800 carriages, released at 8 a.m. on 5 September 2026. To stop hoarding, the operator capped each passenger at 10 outbound and 10 return tickets and raised peak-period cancellation fees to 30%.

For data, the network itself is not the problem — Vietnamese carriers handle Tet traffic. What changes is that every train, bus, hotel and domestic flight is full, so urban cells carry holiday demand on top of tourist demand, and a phone that measured 120 Mbps in Hanoi in March may measure a fraction of that at Tet. Book transport and accommodation by November or December, and treat your eSIM as the one part of the trip that needs no booking.

Typhoon season in central Vietnam’s provinces

Central Vietnam’s typhoon window peaks from mid-September to mid-November, with landfall typically between Quảng Bình and Quảng Ngãi — which puts Hue, Da Nang and Hội An directly in the path. The recent record is specific: Typhoon Trami in October 2024 dropped more than 600 mm of rain on Hội An in 72 hours; Tropical Storm Bualoi in September 2025 closed Da Nang International Airport for close to 48 hours and cancelled more than 180 flights; and the October–November 2025 floods put 825,638 customers across Quảng Trị, Hue, Da Nang and Quảng Ngãi through a power outage at some point, with 475,874 off supply at the peak. Typhoon Kalmaegi made landfall on 6 November 2025 and left 330,506 customers without power, predominantly in Gia Lai and Đắk Lắk.

What that means for the phone in your pocket: a base station on backup power keeps serving when the local grid fails, but a flooded or landslid site is simply gone, and local outages typically last 24 to 72 hours. Plan the way the locals do — download offline maps, carry a power bank, keep cash because ATMs go down with the grid, and remember that the North–South railway keeps running when roads flood, which makes the train the most reliable way to move during a storm.

On-the-road questions about Vietnam carrier eSIMs

Which carrier is best for a Vietnam eSIM overall?

Viettel. It won Best Mobile Network in Ookla’s 1H 2025 report with a 165.03 Mbps median download, leads 5G availability at 50.4%, recorded 97.4% consistency, and was the fastest provider in 59 of 63 regions — including every mountain province and the Mekong Delta. Vinaphone wins only on raw 5G speed in cities. If your route leaves the urban triangle of Hanoi–Da Nang–Ho Chi Minh City, Viettel is the answer.

Is passport verification mandatory for SIMs in Vietnam?

Yes, without exception. Under Decree 49/2017/ND-CP every SIM must be registered to verified identity, and carriers are legally required to deactivate unregistered lines. Bring your physical passport — scans and photos are rejected — and expect a live selfie during eSIM self-registration. Registration takes 5–15 minutes at an official counter.

Where to source your Vietnam eSIM

Through resellers, yes — many sell Viettel-network tourist eSIMs that arrive by email as a QR code with no local paperwork. Buying from Viettel’s own channels generally involves passport verification, either online or at a counter on arrival. If you want a working connection the moment the plane lands, a pre-purchased travel eSIM is the smoother path.

Does your handset do eSIM in Vietnam?

A carrier-locked phone will install the eSIM but won’t connect — unlock it with your home carrier first. Mainland-China iPhone models have eSIM disabled in hardware and cannot use any eSIM; a physical Vietnamese SIM is the only option there. Vietnam’s carriers have fully shut down 2G and 3G, so the phone also needs VoLTE support to make calls.

The 5G picture in Vietnam

Yes — both have had commercial 5G since late 2024 from Viettel and Vinaphone, with Mobifone following in mid-2025. Expect 5G in central districts, airports and tourist zones, with 4G fallback in between. Per Ookla’s 1H 2025 data, even Viettel’s users spent about half their time on 5G, so don’t count on constant 5G outside dense areas.

Why is my Vietnam eSIM slow in Ho Chi Minh City when Vietnam ranks 9th globally?

HCMC recorded the slowest median mobile speed (117.89 Mbps) of Vietnam’s major cities in 1H 2025 — a congestion artifact of ~9 million people and 127 million national SIM connections. It is still fast by global standards. Peak-hour slowdowns in District 1 and around Ben Thanh market are network loading, not your eSIM.

APN values for Viettel, Vinaphone and Mobifone eSIMs

Manual entry is almost never needed on a travel eSIM — provisioning is automatic. If you bought directly from a carrier and have signal but no data, Viettel uses v-internet (blank credentials), Vinaphone uses m3-world, and Mobifone uses m-wap (both mms/mms). Full table above.

Can I use my eSIM in the mountains of Sapa or Ha Giang?

In the towns and main viewpoints, yes — Lào Cai province recorded a median 85.92 Mbps and Ha Giang 85.88 Mbps, both on Viettel’s network. On the remote passes and village trails, expect intermittent 4G and genuine dead zones. Viettel is the only carrier worth considering for the far north; download offline maps regardless.

Will SMS verification codes reach me without a Vietnamese number?

SMS verification is usually not an issue — most travel eSIMs are data-only, so SMS verification codes (Grab, banking, hotels) go to your home number over your physical SIM, if roaming is enabled there for SMS. A carrier-bought Viettel or Vinaphone tourist eSIM does include a Vietnamese number. Keep your home SIM active for calls and codes, put data on the eSIM, and switch off data roaming on the home line to avoid surprise charges.

Choose a Vietnam eSIM by trip type

Not a Vietnam-only one — it stops working at the border. Regional Southeast Asia eSIMs cover Vietnam alongside its neighbors; if you are crossing overland, our guides to Thailand’s networks and Cambodia’s networks explain what changes at the border, and the Vietnam eSIM plan page includes options that fit longer regional itineraries.

Activation steps for Vietnam eSIMs

Confirm the phone is unlocked and eSIM-capable, re-scan the QR code on stable Wi-Fi, verify the eSIM is the selected data line with data roaming on, then check the APN if data still won’t flow. A line that worked and then died usually failed passport registration — go back to the issuing counter. For persistent errors, the eSIM troubleshooting resource covers each failure symptom in order.

Vietnam bargain data plans

On paper, no — a local Viettel tier starts at 60,000 VND and Vietnamese data averages about USD 0.29 per gigabyte, which no travel eSIM can beat. In practice the local SIM costs you a passport handover, a counter queue and a 24–48 hour registration risk if the paperwork is not completed. For trips under two weeks most visitors find the small premium worth paying; for a month-long stay the local plan wins comfortably.

Where do the numbers in this guide come from?

• Ookla Speedtest Connectivity Report — Vietnam 1H 2025 — carrier, city and province results throughout this page — Viettel’s 165.03 Mbps median download and 97.4% consistency, Vinaphone’s 594.16 Mbps median 5G download, Mobifone’s 74.46 video score, and the city-level table — all come from the per-carrier report.

• Ookla Speedtest Global Index — the national median of 219.93 Mbps, the 9th-place ranking and 19 ms latency are listed on the Vietnam entry, updated monthly.

• VietnamPlus / Ministry of Science and Technology — Viettel’s 15 October 2024 launch, VNPT’s December 2024 launch, Mobifone’s June 2025 entry and the 91.2% population coverage figure for December 2025 are set out in the 5G rollout chronology.

• Ministry of Science and Technology (formerly MIC) — telecom licensing and spectrum rules are published on the regulator’s English site. Vietnam’s Ministry of Information and Communications merged into the Ministry of Science and Technology on 18 February 2025; the site domain remains.

• Cable.co.uk worldwide data pricing — Vietnam’s USD 0.29 average price per gigabyte is drawn from the full country table.

• DataReportal / GSMA Intelligence — the internet-user and mobile-connection figures are recorded in Vietnam’s digital 2025 headline data.

• Vietnam Immigration Department — e-visa validity of up to 90 days, the USD 25 single-entry and USD 50 multiple-entry fees, and the rule that e-visa holders must use designated international border gates are stated on the National e-Visa portal linked in the border section above.

• Carrier pages — passport registration steps and the tourist plan pricing quoted above are documented in Viettel’s tourist eSIM material.

Every network figure on this page is third-party and publicly available. Your experience will differ by handset, band and how busy the local cell is — treat the numbers as a way to compare carriers, not a promise for a specific street corner.

Get your Vietnam eSIM ready before you fly

Roami’s Vietnam eSIM links to Viettel, Vinaphone and Mobifone, switching networks on its own as you travel from Sapa down to the Mekong Delta. Prefer to check it first? Grab a free trial eSIM, then order your Vietnam eSIM plan and get the QR code in minutes.

Buy Vietnam eSIM now

First-time Roami users can claim the free trial at no cost.

Free Vietnam trial eSIM

Either way, set it up before departure: check your phone against the handset compatibility checker, try the Roami free trial eSIM, and apply WEB20 at checkout should you move up to a full Roami plan for Vietnam.