Travel Cambodia eSIM | Smart, Cellcard & Metfone
Roami
Roami is a global eSIM carrier focused on travel connectivity. This guide is compiled from network data, official carrier and manufacturer documentation, and traveler inquiries.
📑 Table of Contents
A Cambodia eSIM sits in a market that is both among the cheapest on earth for data and brand new to 5G — this guide splits those two questions apart. Cambodia is an unusual eSIM market in two directions at once. Local data costs pennies — Cable.co.uk ranks it 5th of 237 countries at roughly USD 0.12 per gigabyte — and yet commercial 5G only went live on 1 January 2026, when the telecoms ministry cleared Smart, Cellcard and Metfone to light up the first phase of their new networks. So the question “is 5G fast enough in Cambodia?” has a short answer (it is early days) and a useful one: what actually matters for a Cambodia eSIM right now is 4G consistency outside Phnom Penh and Siem Reap, plus knowing how SIM registration works at the airport.
This guide covers the three things a traveller needs: what each carrier offers now that 5G exists, how to get connected as a visitor (including the passport registration rule that applies to every local SIM), and where coverage genuinely thins out — the temples, the islands and the northeast. Handset support is a one-time check on our compatibility lookup tool.
The short answer: Smart is the network to beat in Cambodia — it led the country on overall mobile speed before 5G (median 59.76 Mbps in Ookla’s H1 2025 report) and again in the first full quarter of commercial 5G (178.14 Mbps all-technology median, Q1 2026). Cellcard owns the video experience and posted the highest early 5G speed readings (548.27 Mbps median 5G download in a light-traffic launch quarter). Metfone is the rural and border-province specialist. Phnom Penh and Siem Reap have the 5G; everywhere else runs 4G for now. Install a Cambodia eSIM before you fly and skip the airport counter entirely.
Cambodia’s 5G launch: what Smart, Cellcard and Metfone now deliver
Cambodia’s five-year regulatory pause on 5G trials ended in 2024, and on 1 January 2026 the Ministry of Post and Telecommunications cleared Cellcard (CamGSM), Smart (Smart Axiata) and Metfone (Viettel Cambodia) to launch commercial 5G simultaneously. The three networks activated 767 5G sites on launch day and passed 1,500 by early March, concentrated on Phnom Penh and Siem Reap plus key areas of roughly a dozen more provinces.
What the first full quarter of measurement shows (Ookla, Q1 2026):
| Metric | Smart | Cellcard | Metfone |
|---|---|---|---|
| Median 5G download | 336.01 Mbps | 548.27 Mbps | 217.90 Mbps |
| 5G availability | 31.4% | 17.9% | 16.1% |
| All-technology median download | 178.14 Mbps | 111.56 Mbps | 52.26 Mbps |
Two honest caveats from that data. Launch-quarter 5G speeds run high because almost nobody is on the new networks yet — Ookla itself frames these readings as a baseline, not a final ranking. And 5G availability in the teens and low thirties tells you the practical story: most Cambodian connectivity in 2026 still happens on 4G, where Smart has led the all-technology speed measure every quarter since early 2025.
It is worth being precise about what Cambodia’s new 5G does and does not change for a visitor this year.
What changes in Phnom Penh and Siem Reap: genuine 5G speeds (the launch-quarter medians ran from 217 to 548 Mbps), lower latency for ride-hailing and video calls, and headroom in the densest districts that 4G was starting to strain under. If your phone supports n78, you will feel the difference downtown and around the airports.
What does not change yet: everywhere else. The launch map covers the two tourist capitals plus key areas of roughly a dozen provinces; Battambang, the coast and the northeast ride 4G for now. And because early 5G networks run light on traffic, today’s speed readings will settle downward as adoption grows — plan around consistency, not launch-quarter records.
The practical data budget. A temple-and-cities trip is light: maps, PassApp rides, translation and social uploads fit in 3–5 GB for a week, and the world’s-cheapest-data benchmark means hotel Wi-Fi is rarely the constraint it is elsewhere. Island days are the exception — Koh Rong’s patchy coverage makes offline entertainment the smarter download than any plan upgrade. If you do run short, most travel data plans support a one-tap top-up from the account dashboard, and note that hotspot use draws from the same balance — a laptop-heavy afternoon at the coast burns credit faster than a temple week.
Crossing the Mekong borders. Cambodia’s land crossings — Poipet into Thailand, Bavet into Vietnam — are where a Cambodia-only profile quietly stops working, and neither neighbour sells forgiving day passes at the booth. If your itinerary strings Bangkok, Siem Reap and Ho Chi Minh City together, plan it with a Thailand eSIM and a Vietnam eSIM rather than betting on one profile for the whole loop.
Which Cambodian carrier has the best coverage and speed?
Smart Axiata vs Cellcard: which Cambodia carrier is faster?
Smart’s lead predates 5G. In Ookla’s H1 2025 Cambodia report it recorded a median download of 59.76 Mbps with upload of 12.04 Mbps, the lowest latency in the country at 37 ms, and a consistency figure of 90.8% of samples above 5 Mbps down / 1 Mbps up — the metrics that matter when you are uploading temple photos from a moving tuk-tuk. The Q1 2026 data shows the same order carrying into the 5G era: fastest all-technology median and, at 31.4%, nearly double the 5G availability of either rival.
For a visitor, Smart is the default answer: strongest in Phnom Penh and the tourist corridor, best latency for ride-hailing and navigation apps, and the widest general footprint.
Is Cellcard good for streaming?
Cellcard is Cambodia’s home-grown operator and it invested early in video optimisation — its 73.10 video streaming score led the H1 2025 report, and it posted the single highest 5G speed reading of the launch quarter at 548.27 Mbps median download. In practice Cellcard is a strong choice in Phnom Penh, Siem Reap and Sihanoukville, particularly if your evenings involve streaming rather than just messaging.
Metfone: the rural and border-province specialist
Metfone (Viettel Cambodia) is the operator with the deepest provincial and border-area coverage, and it rounds out the launch trio’s 5G map. Ookla’s launch-quarter numbers put it third on speed, but its 4G reach into provinces like Mondulkiri, Ratanakiri and Kampot is the reason it matters in a comparison at all: if your route spends real time in rural Cambodia, Metfone-based coverage is the safety net.
MekongNet: fixed broadband, not a Cambodia eSIM carrier
MekongNet is often mentioned alongside these three, but it is a fixed-line ISP, not a mobile carrier — its claim to fame is the fastest fixed broadband in the country (median download 54.29 Mbps). It is relevant to a Cambodia eSIM only as context: guesthouses and co-working spaces in Phnom Penh and Siem Reap run on fixed ISPs like MekongNet, which is why your eSIM and the accommodation Wi-Fi are complements, not competitors. Long-stay remote workers should plan around the fixed connection at their base and use the eSIM for mobility.
Cambodia’s numbers changed character in a single quarter. The Ministry of Post and Telecommunications coordinated a simultaneous commercial launch across Smart Axiata, Cellcard and Metfone on 1 January 2026, each operator on 100 MHz of 3.5 GHz C-band spectrum. Operators switched on 767 5G sites on launch day and passed 1,500 sites by early March 2026. Ookla’s Q1 2026 measurement — the first full commercial quarter — puts the national 5G median download at 356.63 Mbps, a 7.29x uplift over 4G, ahead of several far more mature regional 5G markets.
Which carrier wins which 5G metric?
| Metric | Cellcard | Smart Axiata | Metfone |
|---|---|---|---|
| Median 5G download | 548.27 Mbps | 336.01 Mbps | 217.90 Mbps |
| 5G Availability | 17.9% | 31.4% | 16.1% |
| Median download, all technologies | 111.56 Mbps | 178.14 Mbps | 52.26 Mbps |
Read those three rows together and the story inverts. Cellcard has the highest 5G peak; Smart Axiata has the most 5G. Smart leads 5G Availability at 31.4%, nearly double Cellcard’s 17.9%, and it has led the all-technology median every quarter since Q1 2025 — a lead that predates the 5G launch. Availability is the metric that decides whether your phone is actually on 5G while you are walking around Siem Reap, and on that measure Smart is the operator to want.
Metfone undercuts the others on price, and the performance cost is measurable: a 52.26 Mbps all-technology median sits next to Smart’s 178.14 Mbps. Its 5G footprint is the narrowest of the three at 16.1% availability. For a temple week it is fine; for a work trip it is not.
One honest caveat that the report itself makes: these are first-quarter numbers on a lightly loaded network. The sample is concentrated among early adopters in Phnom Penh and Siem Reap, and speeds typically fall as adoption broadens and traffic builds. Treat the operator ranking as a baseline, not a verdict — and expect the differential between the three to narrow through 2026.
Where Cambodia eSIM performance holds up, route by route
| Route | What to expect | Practical note |
|---|---|---|
| Phnom Penh | The densest 5G deployment in the country | The place to run heavy uploads or a video call |
| Siem Reap and Angkor | 5G in the city and around the main temple circuit | Stone interiors block everything — step outside the galleries |
| Sihanoukville and the coast | Urban 4G, 5G arriving | Ferry crossings thin out; screenshot your ticket |
| Koh Rong and the islands | Patchy at best, resort Wi-Fi dependent | Download entertainment before the boat |
| Battambang, Kampot, Kratie | Solid 4G in town, rural gaps between | Fine for maps, not for streaming |
| Poipet and Bavet border crossings | Cambodian coverage stops at the line | A single-country plan dies here — see the border note below |
Getting connected in Cambodia: registration, tourist SIMs and eSIMs
Every SIM in Cambodia — tourist or local — requires identity registration against a passport. The carrier’s airport booth or city store takes your passport details before the line goes live, and activation is usually immediate. Physical tourist SIMs are sold at carrier counters in arrivals at both Phnom Penh’s Techo International Airport and the Siem Reap–Angkor International Airport, with prepaid tourist products that bundle generous data at prices only this market can offer.
A travel eSIM changes the order of operations rather than the outcome: registration happens at online purchase, the profile installs at home, and the line attaches to Smart or Cellcard when you land. That is worth real time on arrival — the airport queues for SIM cards in Phnom Penh run long in high season, and ride-hailing apps (PassApp above all) need working data the moment you clear immigration. Install on Wi-Fi at home, keep your home SIM active for SMS verification, and set the eSIM as your data line — the mechanics are in how eSIM installation works.
💡 If you would rather test before you buy, Roami’s free trial eSIM lets you confirm everything works at no cost, and the current plans live on the Cambodia eSIM page.
Cambodia eSIM speeds and prices
For August 2026, Ookla’s Speedtest Global Index measured a median mobile download of 111.9 Mbps in Cambodia — 43rd globally, with 18 ms latency, and above the worldwide median of 109.05 Mbps. A travel eSIM rides on exactly this infrastructure. No figure here stands on one source alone; each carries at least one backup.
Cable.co.uk prices 1 GB of Cambodian mobile data at roughly USD 0.12 — 5th of 237 markets against a USD 2.59 global average, which makes Cambodia one of the cheapest data markets on the planet. That cheapness is the baseline your travel eSIM competes against: the case for the eSIM is convenience and instant setup, not price arbitrage over local prepaid.
Cambodia’s 2025 figures from DataReportal show 10.8 million internet users (60.7% of the population) and 25.3 million connections — 143% — a market where SIMs comfortably outnumber people.
Your eSIM coverage: Phnom Penh, Siem Reap and the coast
| Destination | Best carrier | Why it works |
|---|---|---|
| Phnom Penh | Smart | The densest 5G footprint in the country, highest all-technology speed, lowest latency for PassApp and delivery apps. Expect congestion around the riverside and the markets at peak. |
| Siem Reap & Angkor | Smart, Cellcard | 5G reached Siem Reap in the launch phase. Cellcard’s video performance suits long evenings; Smart holds the stronger general footprint. Temple interiors block signal on every network — the wider park is fine. |
| Sihanoukville & the islands | Smart, Cellcard | Coastal resorts and the city are well covered. Koh Rong and Koh Rong Samloem are patchy — islands are where 4G coverage stops being a given. |
| Battambang & the northwest | Smart | Coverage follows the towns and the national roads; long gaps appear between settlements. |
| Kampot, Kep & the south coast | Metfone, Smart | Metfone’s provincial depth shows in the smaller southern towns; the coast road has dead stretches. |
| Mondulkiri & Ratanakiri | Metfone | The northeast is the hardest coverage in Cambodia. Signal exists in the towns; the roads between them are offline stretches. |
Install your Cambodia eSIM before you leave
Nothing in this sequence needs a shop, a passport or a signature. Order the profile, take delivery by email, add it under Settings, then switch on data roaming for that line. Do it at home rather than at Phnom Penh’s arrivals Wi-Fi, which works but is slow enough that you will not want to be debugging a profile on it. Activating an eSIM on iOS or Android is covered separately.
Two Cambodia-specific checks solve most “installed but not connected” cases. First, data roaming: the profile must be allowed to roam onto the local network, and this toggle is the single most common culprit. Second, network selection: if the phone hesitates, pick the carrier manually from the network list (Smart or Cellcard, depending on your plan) rather than waiting for automatic selection. If neither fixes it, the broader catalogue of causes lives in our eSIM problem-solving guide.
One more practical tip for temple days: Angkor’s stone blocks do to signal what they did to sieges. Expect the interiors of the big temples to be dead for every carrier, with solid 4G and growing 5G across the park roads, the town and the hotels.
Bands, handsets and the Cambodia eSIM compatibility question
| Technology | Bands in use | What it means for your phone |
|---|---|---|
| 4G LTE | 1800 MHz (B3), 2600 MHz (B7) | The two bands that carry most Cambodian traffic; almost universal on handsets sold outside China |
| 4G LTE (reach) | 900 MHz (B8) | Rural and provincial coverage, including Metfone’s wider rural footprint |
| 5G | 3.5 GHz C-band (n78) | All three operators launched on n78 in January 2026; a 2020-or-later flagship or mid-range 5G handset covers it |
| Legacy | 2100 MHz UMTS, GSM 900/1800 | Voice fallback; some older devices still lock onto it indoors |
The n78 requirement is the one worth checking. Plenty of handsets sold in markets where 5G runs on other bands lack it entirely — they will work perfectly on 4G and never show a 5G icon in Cambodia. Run your exact model through the eSIM compatibility checker rather than guessing from the spec sheet.
Do you need an APN for a Cambodian carrier SIM?
Only relevant if you bought a Cambodian line directly. A travel eSIM brings its own profile.
| Carrier | APN | Username | Password |
|---|---|---|---|
| Cellcard | cellcard |
blank | blank |
| Smart Axiata | smart |
blank | blank |
| Metfone | metfone |
blank | blank |
The values are the operator names in lower case, which is why people assume they cannot be the answer. Leave username and password empty, set authentication to PAP or CHAP, save, then toggle Airplane Mode for ten seconds to force a fresh registration.
-
iPhone: Settings → Cellular → the Cambodia line → Cellular Data Network → APN (the user name and password fields stay empty).
-
Android: Settings → Mobile network → Access Point Names → + → type the operator’s name in lower case and save.
Two Cambodia-specific quirks are worth knowing. Some handsets receive an incomplete automatic profile, which produces the classic “full signal, nothing loads” symptom — a manual APN entry fixes it. And on dual-SIM devices, make sure the Cambodian profile, not your home line, is the one carrying data.
Local SIM vs travel eSIM: cost comparison
| Step | What happens |
|---|---|
| Buy | Airport arrival-hall counters, operator stores, convenience shops and street kiosks. Airport is pricier and easier; town is cheaper |
| Register | Registration is mandatory and enforced: your passport is entered into the operator’s system at the point of sale |
| Price shape | Starter SIM plus a short data bundle costs a few dollars; a week of comfortable use is a small multiple of that |
| Activate | Staff usually install and activate on the spot. Check the APN before you walk away |
| Top up | Vouchers at shops and kiosks, or the operator app |
The registration rule is the part that changes the calculus. It means a passport is a hard requirement, it means a market-stall SIM is registered to you rather than anonymous, and it means the ten minutes you spend in a queue is unavoidable. A travel eSIM skips the queue entirely — and for a temple-and-island itinerary that is usually the right trade.
How much data do I need for Cambodia?
| Trip | Typical length | Comfortable allowance | Why |
|---|---|---|---|
| Phnom Penh city break | 3–4 days | 3–5 GB | Hotel Wi-Fi covers the evenings |
| Angkor and Siem Reap | 4–5 days | 4–6 GB | Temple days burn maps, photo sync and tuk-tuk apps |
| Phnom Penh plus the coast | 7–10 days | 8–12 GB | Two transfers, ferry bookings, no reliable Wi-Fi on the islands |
| Island week on Koh Rong | 5–7 days | 4–6 GB | Offline entertainment beats a bigger plan |
| Remote-work fortnight | 14 days | 20 GB+ | Video calls need both bandwidth and a city address |
A Cambodia eSIM checklist and the four failures to fix
| # | Check | What “good” looks like |
|---|---|---|
| 1 | Handset is unlocked | “No SIM restrictions” under Settings → About |
| 2 | eSIM hardware is present | An EID appears when you dial *#06# |
| 3 | QR code saved in two places | Screenshot on the phone and in cloud storage |
| 4 | Profile installed before departure | Over home Wi-Fi, not on airport Wi-Fi |
| 5 | Data line and roaming set | eSIM carries mobile data, data roaming on for that line |
Failure 1 — nothing installs at all. The two culprits are a carrier-locked handset and a QR code used once already. Single-use codes cannot be re-scanned, so ask for a reissue rather than retrying.
Failure 2 — it installs and never registers. Give the radio a clean scan: switch flight mode on, count fifteen, switch it off. Then open Network Selection and choose Smart Axiata, Cellcard or Metfone by hand, because automatic selection can settle on a provincial cell it cannot hold. Restart between the two attempts.
Failure 3 — signal bars but nothing loads. This is the incomplete-APN pattern. Check the eSIM is the data line, verify the APN against the table above, and only then consider other causes.
Failure 4 — the handset reports “Emergency calls only”. Two profiles fighting over one radio is the usual cause here. Switch the second one off, restart, reset network settings, and leave a fresh install for the very end.
Cases beyond these four are collected in the troubleshooting catalogue, while the generic install order is set out in the activation walkthrough.
Cambodia’s temple and island itineraries, connected day by day
The country’s headline 5G numbers are impressive and narrow: they describe Phnom Penh and Siem Reap on a network that went commercial on 1 January 2026. An actual two-week itinerary spends much of its time outside those two cities, so here is how connectivity behaves across the route most visitors take.
| Day | Where you are | Data reality | What to do about it |
|---|---|---|---|
| 1 | Phnom Penh arrival | 5G, the densest deployment in the country | Install nothing — the profile is already live; just test the APN |
| 2–3 | Phnom Penh, Tuol Sleng, the Royal Palace | Full-speed 5G throughout | Upload anything heavy here rather than on the coast |
| 4 | Road to Siem Reap, 5–6 hours | 4G in towns, gaps on the highway | Download an offline map of the whole route before departure |
| 5–7 | Angkor, Banteay Srei, Tonle Sap | 5G in the city and around the main circuit | Stone galleries block signal — step outside the temples |
| 8 | Siem Reap to Sihanoukville, by air or road | Air is clean; the road has long rural stretches | If driving, screenshots of the guesthouse address and phone number |
| 9–10 | Sihanoukville and Otres | Urban 4G, 5G arriving | Ferry bookings need data at the pier — do it the night before |
| 11–13 | Koh Rong or Koh Rong Sanloem | Patchy at best, resort Wi-Fi dependent | Download films, music and maps before the boat |
| 14 | Return leg, or the border | Coverage ends at Poipet or Bavet | A second profile for Thailand or Vietnam if the trip continues |
The pattern to internalise is that Cambodia’s connectivity is front-loaded: the two cities where you will spend the least time have the best network, and the coast and islands where you will relax have the weakest. Practically, that means doing your uploads early — a week of temple photos synced from Siem Reap costs a fraction of what the same job costs from an island with one shared satellite link.
Two specific traps are worth naming. Boat and ferry piers are where bookings have to be confirmed and where a dropped connection costs a place on the next sailing, so confirm travel the evening before rather than ten minutes before. And the land borders at Poipet and Bavet are where a single-country profile dies without warning — if the route strings Bangkok, Siem Reap and Ho Chi Minh City together, our Thailand eSIM guide and Vietnam eSIM page cover the legs on either side.
Which eSIM should I buy for a multi-country trip?
Plenty of travellers pair Cambodia with its neighbours, and the decision is less complicated than the marketing suggests.
| Your itinerary | What to buy | Why |
|---|---|---|
| Cambodia only | A Cambodia eSIM | Best price per gigabyte and no coverage you cannot use |
| Cambodia plus Thailand or Vietnam | A Southeast Asia regional plan | One install covers the loop and the borders stop mattering |
| Cambodia plus a long detour elsewhere | Country profiles per leg | Regional bundles vary in which countries they include |
The trap is buying a single-country profile for a three-country loop and discovering it at the Bavet or Poipet crossing. If the route comes back on itself, the regional plan wins on simplicity even when it costs marginally more.
What travelers ask about eSIMs and 5G in Cambodia
Is 5G available everywhere in Cambodia?
No. Commercial 5G launched on 1 January 2026 in Phnom Penh, Siem Reap and key areas of roughly a dozen other provinces, with the build-out continuing through 2026. Outside the launch areas your eSIM runs on 4G — which, given Smart’s 90.8% consistency score, is not the downgrade it might sound like.
Will my phone take a Cambodia eSIM?
Yes — iPhone XS and newer models install Cambodian profiles without issue, as do Google Pixel 3+ and recent Samsung Galaxy devices. The phone must be carrier-unlocked. Confirm the exact model against our compatibility table before you buy.
Will WhatsApp voice calls connect in Cambodia?
Yes. A data-only Cambodia eSIM uses your existing number for WhatsApp, Telegram and app verification, because your home SIM stays active on the physical slot for SMS. Only data traffic moves to the eSIM. Bank OTPs keep arriving on your home number, so leave its roaming off to avoid surprise charges.
Are anonymous SIMs legal in Cambodia?
The registration requirement attaches to local SIM activation; a travel eSIM profile issued abroad sidesteps the in-person process entirely, which is precisely why airport counters and eSIM checkouts feel so different. Local tourist SIMs, by contrast, require your passport at the counter — bring it either way, since you will need it for immigration regardless.
Is Cambodia’s network good for gaming?
Yes, in the cities. Smart’s 37 ms latency (H1 2025) is excellent for real-time games and video calls, and the 5G build-out is lowering it further in Phnom Penh. In rural provinces, expect video calls to fluctuate and gaming to be best left to the towns.
Can I reinstall my Cambodia eSIM if I delete it?
In most cases yes, by re-scanning the original QR code stored in your account. If the code is lost, support can reissue it. Save a screenshot of the QR before your first install — it costs nothing and removes a whole category of support tickets.
Is 5G worth planning around in Cambodia?
Yes, and Siem Reap is the right base because it was in the first 5G launch phase on 1 January 2026. A plan of 15–20 GB covers video calls, uploads and map use for a fortnight, and guesthouse Wi-Fi absorbs the heavy transfers. What you cannot rely on is the provincially routed days: the further you get from the launch areas, the more the connection falls back to 4G.
Smart Axiata vs Cellcard: which is better in Cambodia?
Smart Axiata for most travellers: it leads 5G Availability at 31.4% and the all-technology median at 178.14 Mbps, a lead it has held every quarter since Q1 2025. Cellcard posts the highest 5G peak in the country at 548.27 Mbps, and Metfone is the budget option at a 52.26 Mbps all-technology median.
Why do the 5G rankings disagree?
Because peak and consistency are different things. Cellcard’s 548.27 Mbps median 5G download was measured on a lightly loaded network with few users competing for capacity. Smart’s 5G is available to a much larger share of its users — 31.4% availability against 17.9% — which is what you feel while walking around a city. Ookla’s own reading is that these first-quarter figures are a baseline and will compress as adoption grows.
Will Cambodia’s 5G speeds stay this high?
Expect them to fall. The Q1 2026 median of 356.63 Mbps reflects an early-adopter user base in two cities on freshly built C-band sites; as more handsets attach and traffic builds, medians typically decline toward the regional norm. The practical consequence is that a plan bought today performs better in 2026 than the same plan will in 2028.
Where Cambodia eSIMs are sold
Phnom Penh airport, the carrier shops in the city, and the phone stalls around Central Market and Psar Thmei all sell prepaid starter packs, usually as Smart or Cellcard tourist bundles with a passport registration at the counter. Prices are low and the queue is short by regional standards; the reason most visitors skip it is that the travel profile was already installed at home.
APN values for Smart Axiata, Cellcard and Metfone eSIMs
If you bought a travel eSIM, none — the profile supplies its own APN. If you bought directly from a carrier, the values are cellcard, smart and metfone respectively, all lower case, with username and password blank. An incomplete automatic profile is the usual cause of “full bars, nothing loads”.
Is the network good for video calls in Cambodia?
In Phnom Penh and Siem Reap, comfortably: 5G medians there are well above what a video call needs, and Smart’s 178.14 Mbps all-technology median is generous even on 4G. On the islands and in provincial towns, plan around unreliable connections rather than fast ones.
Does a Cambodia eSIM work in Thailand and Vietnam?
No — a single-country profile stops at the border. Cambodia’s land crossings at Poipet (to Thailand) and Bavet (to Vietnam) are exactly where an itinerary strands people mid-trip. Compare a Thailand eSIM plan and the Vietnam eSIM options if the route continues.
How much data do I need for Siem Reap?
Four to six gigabytes covers a five-day Siem Reap stay comfortably — maps, tuk-tuk apps, photo back-up and messages, with hotel Wi-Fi carrying the evenings. The temple circuit itself has coverage, but the stone galleries block signal, so offline maps are still worth downloading.
Can I buy a local SIM or eSIM when I land in Cambodia?
You can buy a registered physical SIM at Phnom Penh or Siem Reap arrivals, and staff will usually set it up for you. eSIM from a Cambodian carrier is less predictable than the physical route; a travel eSIM installed before you fly avoids the question entirely.
Is Metfone good enough for a normal holiday?
Yes for messaging, maps and browsing, and it has the widest rural footprint of the three. Its 52.26 Mbps all-technology median and 16.1% 5G availability put it clearly behind Smart and Cellcard in the cities, so it suits a provincial itinerary better than an urban one.
Is Smart Axiata or Cellcard better on the islands?
Neither reaches the islands reliably — Koh Rong and Koh Rong Sanloem sit outside the launch footprint for all three operators, so resort Wi-Fi is the practical connection and the eSIM is a fallback. Smart Axiata’s higher 5G Availability at 31.4% gives it the edge on the mainland approach and around Sihanoukville.
Should I buy a regional plan or one eSIM per country?
A Cambodia-only profile stops working at the Poipet crossing, and buying a Thai line at the border is neither quick nor cheap. Either buy a regional Southeast Asia plan up front or carry separate profiles for each country before you fly.
Will my 5G speeds match the reported figures?
Probably not as fast as the Q1 2026 figures suggest, and that is expected rather than a warning. The 356.63 Mbps national median was measured on a network with a small early-adopter user base on freshly built C-band sites; Ookla’s own reading is that speeds decline as adoption broadens. The operator ranking should also compress.
How many 5G sites does Cambodia have?
Operators switched on 767 5G sites across the three networks on launch day, 1 January 2026, and passed more than 1,500 sites by early March 2026 — a build focused on Phnom Penh and Siem Reap rather than national coverage.
Is a local SIM cheaper than a travel eSIM?
Per gigabyte, yes, usually by a factor of two or more. The difference is the registration queue: a passport, a counter and a member of staff entering your details, which is a real cost on a three-day trip and an easy saving on a three-week one.
Should I buy my Cambodia eSIM before I fly or on arrival?
Before flying, unless you enjoy negotiating at an airport counter. Cambodia’s registration requirement means the on-arrival route is a transaction rather than a purchase, and the profile you install at home works the second the plane lands. If you need a Cambodian number for calls, though, the local route is the only one that provides it.
Tethering from a Cambodia eSIM allowed?
Almost always yes, drawing on the same allowance rather than a separate one. On the islands, where resort Wi-Fi is shared and slow, tethering a laptop to your own connection is often faster than the property’s network — until you hit the plan’s fair-use limit.
Which Cambodian carrier has the widest rural coverage?
Metfone, historically, thanks to its Viettel-backed build-out across provincial Cambodia, and that rural reach is the reason it remains a sensible choice outside the Phnom Penh–Siem Reap corridor despite a 52.26 Mbps all-technology median.
Is 5G worth seeking out in Cambodia?
At 356.63 Mbps national median and 548.27 Mbps on Cellcard’s network, yes — it is genuinely transformative for photo back-up and large downloads, and it is concentrated in exactly the two cities where most visitors spend their first days.
Do I switch the Cambodia profile on before the flight or after landing?
Install it at home, then leave it off until you touch down. Ten minutes on your own Wi-Fi in the days before departure is a better use of time than troubleshooting a QR code on airport bandwidth, and the profile stays dormant until it sees a Cambodian network — so there is nothing to lose by loading it early.
Will one-time passwords still arrive on my home number?
They will, provided you leave your usual line on the physical SIM and let the eSIM handle data only. Banking and booking codes keep landing where they always have, and WhatsApp keeps the number you registered with. What does not work is expecting calls to the eSIM’s data line, which has no voice service.
Are airport SIM packages worth it in Cambodia?
Per gigabyte, sometimes. Per hour of your holiday, no. The airport counters sell tourist packages that look attractive until you count the queue, the passport copy and the activation wait, and Cambodia’s data is already among the cheapest on earth at around USD 0.12 per gigabyte, which is the price the travel profile is built on. Worth it only if you need a Cambodian number for a long stay.
What happens if my allowance runs out on Koh Rong?
Extend from the provider’s dashboard and the same profile keeps working — no new QR code, no reinstallation. Island Wi-Fi on Koh Rong and Koh Rong Sanloem is patchy enough that you should not count on topping up at the moment you notice, so leave yourself a gigabyte of headroom before the boat.
Does one eSIM work on all three Cambodian networks?
Yes. A single Cambodia eSIM roams across Smart, Cellcard and Metfone, so the temple circuits around Siem Reap and the southern islands ride the best available signal without you touching a setting. Plan the allowance around the island leg, where the fallback Wi-Fi is weakest and the temptation to stream is highest.
Where the Cambodia numbers on this page originated
The Cambodian figures come from four published sources. The 5G launch detail — the 1 January 2026 date, the 767 sites activated on day one and the per-operator medians from the first quarter — is from Ookla’s Mekong 5G analysis, cross-checked against The Star’s report on the MPTC announcement for the launch date and the first-phase provinces.
The national median of 111.9 Mbps and Cambodia’s 43rd-place ranking come from Ookla’s monthly Global Index. The USD 0.12 per gigabyte is from Cable.co.uk’s 237-market survey, and the 10.8 million internet users and 25.3 million connections from DataReportal’s Digital 2025 entry.
None of it is our own measurement. A launch-quarter median tells you what the network can do, not what it will do on the day you land.
Get your Cambodia eSIM ready before you fly
The first working signal of your trip should not be the airport Wi-Fi. Install before you fly and the profile is live by the time you clear immigration at Phnom Penh.
First-time customers can begin with a free Cambodia trial, and the paid tiers — data-only and unlimited alike — are on the Cambodia eSIM page.
Try it free first if you are new
Want to compare before you pay? Roami’s free starter eSIM covers the same ground as the carriers above in Cambodia, and WEB20 shaves 20% off your first full plan. Any compatibility doubts? The checker clears them up in a minute.
