Where to Buy a Vietnam SIM Card: Airport, City Shop or eSIM

The phrase Vietnam SIM card covers three products that are sold in the same buildings, priced differently and registered under different rules. Confusing them is how travelers end up paying twice as much at Tan Son Nhat for a card they could have installed in their kitchen, or buying a cheap downtown card that turns out to be registered to a stranger.

This page prices all four buying channels in the two currencies that matter, dong and minutes, and then deals with the part competitors skip: what Vietnamese registration law means for a card you buy as a visitor, why some tourist cards are registered to somebody else, and what you can do about it at the counter.

The short version. If your phone supports eSIM, buying before you fly costs $1.99 for a three-day plan and takes six minutes at home with no queue. If you need a physical card, city shops in Hanoi and Ho Chi Minh City run roughly half the airport asking price for the same thirty days, and the extra hour of your time is the trade. The airport is worth its premium in exactly two situations, and neither is “I did not plan”.

Three different products get called a Vietnam SIM card

Start with the vocabulary, because each product has a different price structure and a different registration requirement.

A tourist SIM. Sold at airports, city phone shops and through hotel desks. Thirty days, a large data allowance, a Vietnamese phone number, passport registration at the counter. The card is usually pre-activated by the shop before you buy it.

A local prepaid SIM. The card a Vietnamese resident buys. Cheaper per gigabyte, sold in convenience stores and carrier shops, registered to the buyer’s national ID. A foreigner can buy one with a passport, but the registration is tied to your document and cannot be transferred later.

An eSIM plan sold outside Vietnam. A data-only profile from an international seller, installed by QR code. No Vietnamese number, no passport registration, no physical card. It connects by roaming onto Viettel, Vinaphone or Mobifone.

The three are not interchangeable, and the price gap between them is not a rip-off. A tourist SIM carries a number and a registration your home eSIM cannot give you; a local prepaid card is cheap because the carrier knows who you are; an eSIM plan is cheap to deliver because there is no shop, no card and no clerk.

If you are still deciding between a card and a profile, the comparison of Vietnam eSIM plans prices the eSIM side per gigabyte. This page is about the physical channels.

What the Tan Son Nhat counters charge for thirty days

The arrivals hall at Tan Son Nhat is the busiest place in Vietnam to buy a SIM, and the price reflects it. Expect an asking price of roughly ₫250,000 to ₫450,000 for a thirty-day tourist card, and expect that price to be quoted in dollars to anyone who answers in English.

The same thirty days from a city shop in District 1 runs closer to ₫150,000 to ₫280,000. That is a gap of one and a half to two times for the same product from the same carriers, and the difference is the rent on the counter.

Two details make the airport price easier to swallow or easier to refuse. First, several counters sell data-only tourist cards without a number, which is what an eSIM already does for less. Second, the airport is where you are most likely to be sold a card registered to the shop rather than to you, because volume sellers process paperwork in bulk. The next section covers why that matters.

Noi Bai, Tan Son Nhat and Da Nang: three arrival halls, three prices

The three international gateways behave differently, and knowing which one you land at changes the advice.

Tan Son Nhat (Ho Chi Minh City). The largest international arrivals hall in the country and the most competitive SIM market in it. Multiple carrier counters plus resellers, all within sight of each other. Prices are the highest of the three and the queues are the longest, but you will not struggle to find someone selling.

Noi Bai (Hanoi). Fewer counters, calmer hall, and a noticeably shorter queue. Prices sit a little below Tan Son Nhat because there is less foot traffic to harvest. If you are heading into the old quarter, the shops on Hang Bac and Dinh Liet will beat the airport by roughly a third.

Da Nang. The smallest international hall of the three and the one where stock runs out. If your flight lands late and the counters are closed, there is no second row of shops inside the terminal. Travelers continuing to Hoi An should either buy before flying or plan to stop in Da Nang city, where the shops around Han Market are open later.

A pattern worth noting: the smaller the arrival hall, the more an eSIM bought at home is worth. At Da Nang it removes a real risk. At Tan Son Nhat it removes mostly inconvenience.

The passport rule, and the cards registered to somebody else

Vietnamese law requires every prepaid line to be registered to a verified identity, under Decree 49/2017 and the tightening that followed it. In practice this means a passport at the counter, a form, and in most stores a photograph of you holding the document. Since 2020 the process has been enforced more strictly than it was during the years when unregistered cards were common. The rule is not a shop policy you can negotiate past — it sits with the Ministry of Information and Communications, and the government portal at chinhphu.vn is where the decrees are published in Vietnamese if you want to read the source rather than a summary.

That history is the reason for the warning that follows. Because registration used to be loosely enforced, a large number of tourist cards in circulation were activated by the shop in bulk, under a business registration or an employee’s identity, and then sold on. The card works. It also has three problems:

• You cannot prove the line is yours. If the card is lost or the number is reclaimed, the registration on file is not your name.
• Some verification systems reject it. A line registered to a company or an unrelated individual behaves differently at a bank or a government portal from one registered to you.
• It can be cut off without notice. When a carrier purges unverified or mismatched registrations, bulk-registered tourist cards are the first to go.

You cannot reliably tell a properly registered card from a bulk-registered one by looking at it. What you can do is buy from a carrier’s own counter rather than a reseller’s, ask to see the registration slip with your passport number on it, and keep that slip. If a seller cannot produce a registration tied to your document, you are buying the first kind.

The eSIM side of this is genuinely simpler: a travel eSIM sold outside Vietnam is a roaming product, not a Vietnamese subscription, so the registration requirement does not apply to you at all. There is no passport, no form and nothing to lose. What you give up is the Vietnamese number, and what that costs you in practice is set out in what a local number is actually good for.

The number on your card probably belonged to someone else

Vietnamese prepaid numbers are recycled. A line that goes unpaid for a period is deactivated, and the number goes back into the pool to be issued again. With tourist cards turning over every few weeks, the odds that your new number was somebody else’s last month are high, and the consequences are more practical than they sound.

Three things can happen in the first days:

• The number is already registered to an app. Zalo, and sometimes a bank or a ride-hailing account, may still be attached to the previous owner. You will find out when you try to register and are told the number is in use.
• You receive calls and messages meant for them. Delivery drivers, debt collectors, someone’s family. Mostly harmless, occasionally persistent.
• A verification code arrives for an account you do not own. This is the one to take seriously. Never use a recycled number as the recovery number for a bank account, an email account or a payment wallet, because the next holder of that number can request a reset.

What to do about it is straightforward. Test the number on the first day by registering the app you actually need, keep the card out of any account recovery flow, and treat it as a number for this trip rather than a number you own. If a code arrives that is clearly not yours, ignore it and do not read it out to anyone who calls asking.

This is also where the eSIM side has an advantage that is easy to overlook. A data-only profile has no number to recycle, so there is nothing to inherit and nothing to inherit you.

Circle K, WinMart and the corner shop: half the price, all of the setup

Convenience stores and supermarkets occasionally stock prepaid starter packs, and when they do the price is the lowest of any channel. The catch is that everything after the purchase is on you.

Some branches of the larger chains carry starter packs; stock varies by store and by week, and the staff member at the till often cannot tell you which carrier the pack on the shelf belongs to. If you find one, expect to handle the activation yourself through a Vietnamese-language website or app, with a registration step that wants your passport details typed in rather than scanned by a clerk.

The convenience-store route makes sense in one scenario: you are staying somewhere with a shop downstairs, you have a translation app, and you are not in a hurry. It is a poor choice for a first arrival with luggage at midnight.

Where the shops are, and what to ask when you walk in

The two cities that most visitors start in both have a concentration of phone shops where prices are competitive because the shop next door sells the same thing.

Hanoi. The streets around Hang Bac and Dinh Liet in the old quarter, a few minutes’ walk from Hoan Kiem Lake, are the densest cluster. Shops there sell all three carriers, quote in dong without prompting, and will do the registration on the spot. Bring the passport; several will not start the paperwork without the physical document.

Ho Chi Minh City. Pham Ngu Lao, Bui Vien and De Tham in District 1 are the backpacker strip and the corresponding SIM market. Prices are similar to Hanoi’s, opening hours run later, and the competition is heavier, which makes it a reasonable place to ask two shops before buying.

Da Nang. The streets around Han Market. Fewer shops than the two big cities and less English, but the same price structure as a city shop anywhere.

Four questions to ask before you hand over money, in this order. Which carrier is this card? How much data, and is it a daily allowance or a total? Can I see the registration slip with my passport number? Can we test a call and a web page here, before I pay? A shop that answers all four without hesitation is a shop worth buying from. One that dodges the second or fourth question is not.

If the shop names a carrier you have not heard of, the official tourism board’s practical pages at vietnam.travel cover arrival formalities but not tariffs, and the carrier’s own site is the only place a package price is authoritative. Treat a street quote as a starting point rather than a rate.

A month in Da Nang, bought three ways

Long stays flip the arithmetic, and it is worth seeing it worked through because the conclusion is the opposite of the short-trip one.

Take a thirty-day stay with heavy use: remote work, daily video calls, around 30GB.

On money alone the city shop wins by a wide margin, and the airport card is the worst of the three. That is the correct answer for a month, and pretending otherwise would be dishonest.

What changes the answer is what you are buying besides data. The eSIM needs no top-up trip, has no recycled number attached to it, cannot be cut off by a registration purge, and works the minute you land. On a thirty-day stay those advantages are worth less per day than on a three-day trip, because you have thirty days to solve a problem rather than three.

A reasonable split for a month: buy the city card for the number and the volume, and keep a small eSIM plan as a backup data line for the days the card needs topping up or the shop’s registration turns out to be the bulk kind. That is not the cheapest arrangement on the table. It is the one that fails least.

If your phone has no SIM tray

One group of travelers cannot use anything on this page except the last column of the table.

iPhone models sold in the United States since the iPhone 14 have no physical SIM tray. If you are traveling from the US with a recent iPhone, there is no slot to put a Vietnamese card into, and no amount of shopping will change that. The same is true of a growing number of eSIM-only Android models sold in some markets.

For those handsets the decision is made for you: an eSIM plan is the only option, and the entire question of airport versus city shop collapses into “which plan, at what price”. The compatibility list names the models, and a free trial profile is the cheapest way to confirm your handset accepts one before you spend anything on a country plan.

There is one workaround worth knowing about for travelers who genuinely need a local number but carry an eSIM-only phone: a second, cheap handset. A basic phone with a physical SIM slot costs less than a month of the wrong data plan, and it turns the number problem into a separate device you can leave in the hotel. It is not elegant. It works, and almost nobody mentions it.

The thirty-day tourist card is not the thirty-day local card

Both say thirty days. They are priced differently because they are different products, and the difference is not only the registration.

A tourist card is built for data volume: a large allowance, sometimes split into a daily high-speed portion with a throttle afterward, and a number that can receive SMS. The local prepaid card is built for a resident’s usage pattern: smaller base packages, cheap top-ups, and a tariff structure that assumes you will be recharging every week.

Read the tourist card’s daily allowance before comparing prices. A thirty-day card advertising “unlimited” with a 2GB daily high-speed figure is a 60GB card in practice, and a thirty-day card advertising 60GB flat is a different product that behaves better on a heavy day. The arithmetic is the same one used in the plan comparison, and it applies to physical cards too.

The other difference is support. A tourist card bought at a carrier counter can be replaced at any branch of that carrier. A bulk-registered card bought from a reseller often cannot.

Klook and the voucher counter: what three dollars buys

Booking a SIM through Klook or a similar platform gets you a voucher that you exchange at a partner counter, usually in the same arrivals hall as the carriers. You pay a small margin over the local price, typically a few dollars, for a booking flow in English, a support channel in your own language and sometimes a bundled transit card or a discount on an airport transfer.

Someone on their first trip here, nervous that the phone will not work and unwilling to troubleshoot in a language they do not speak, is buying a person rather than a chip, and a few dollars is a reasonable price for that. Someone who has installed an eSIM before is buying a queue they already know how to avoid.

Two cautions. Voucher counters keep counter hours rather than airport hours, so a late arrival may find them shut while the carrier desks are still staffed. And a voucher is not a reservation: if the counter has run out of the package you booked, you are negotiating at the desk, not through the app.

Two hundred and fifty thousand dong buys this many gigabytes

Converting dong to data is the fastest way to compare a physical card with an eSIM, because the two are quoted in different units. The table below uses approximate 2026 asking prices and is meant for comparison rather than as a price list; confirm the figure at the counter.

The pattern is consistent: at the low end the eSIM is cheaper because there is no card, no clerk and no queue. In the middle the two converge, because a physical card at that price includes a number and local support. At the top the physical card wins on raw data, which is the one scenario where buying at a counter is the better deal.

Two things a physical card includes that the price column does not show, and both are worth asking about at the counter. Most tourist cards bundle a small allowance of domestic call minutes, which is what makes them useful for confirming a hotel booking or calling a driver. And most of them permit hotspot, sometimes with a separate cap. Neither feature appears in the headline number, and both change the comparison against an eSIM if you were planning to make local calls or share a connection.

Charging a local card: USSD codes and a bank account you do not have

Topping up a Vietnamese prepaid card is the step that catches people, because the payment methods assume a resident.

The two routes that work for a visitor are scratch cards and shop-assisted top-ups. Scratch cards, sold at every convenience store and phone shop, carry a code you enter through a USSD string on the handset. Shop-assisted top-ups cost a small commission and require you to hand over the number and the cash. Both work; neither is convenient at 10pm on a Sunday.

The routes that do not work without local infrastructure are the app-based ones. Carrier apps and e-wallets want a Vietnamese payment method and, for full functionality, a Vietnamese identity document. A foreign card sometimes works in the carrier app, and sometimes does not, which is not a basis for planning.

The specific USSD strings differ by carrier and change occasionally. Our carrier guide for Vietnam lists them by operator, along with what each package includes. Read it before you rely on a top-up, not after the card runs dry. If you want the current figure from the source, Vinaphone’s own site publishes its top-up codes and package list, and the other two operators do the same.

An eSIM plan avoids this entirely: top-ups happen in the seller’s app, paid with the card you already used, in about a minute. That convenience is worth more on a two-week trip than the few dollars it costs.

Buying for two people without paying twice

A couple or a family arriving together usually buys two cards, and usually only needs one and a half.

Three arrangements work, in ascending order of cost and descending order of friction:

One data card plus tethering. Cheapest. One phone carries the connection and the other borrows it. Workable for two people who stay together, painful the moment one of you walks off to a market and the other is navigating.

Two data-only cards. The middle option, and the one most couples should take. Two connections, two batteries, no dependency. At a city shop this is often still cheaper than one airport card.

One card with a number, one data-only. The right answer if one of you needs to make local calls, receive SMS from a hotel or use a Vietnamese app. The split costs less than two voice cards and covers more situations.

For a family with children, the tethering arrangement reasserts itself because the adults stay together by default and a child’s phone does not need its own plan. Buy the larger data tier on the adult’s card and skip the second purchase.

The ten minutes after you pay, and how to spot a dead card

Whatever channel you used, the purchase is not finished when money changes hands. Run this in order before you leave the counter.

The photograph step matters more in Vietnam than in most countries. A registration slip with your passport number is the only document that proves the line is yours, and it is the thing a carrier branch will ask for if the card stops working.

If the card shows a network but nothing loads, the cause is almost always the APN. Most modern handsets pick it up automatically on a tourist card; some Android models need the settings entered by hand. The carrier guide lists the APN values for all three operators, and the troubleshooting case list covers the failures that look like network problems but are not.

When the card dies on day three, and who replaces it

The difference between a properly registered card and a bulk-registered one shows up here, and it shows up fast.

Walk into any branch of the carrier with a card registered to your passport and the registration slip, and the line can be checked, reset or replaced. Walk in with a card registered to a company you have never heard of, and the branch staff will tell you, politely and correctly, that the line is not yours to service. They cannot verify you as the subscriber because you are not the subscriber.

Your options at that point are narrow and worth knowing in advance:

• Buy another card. The realistic answer. It costs what the first one cost and takes fifteen minutes.
• Switch to an eSIM mid-trip. Buying and installing a data plan over hotel Wi-Fi takes about six minutes, and it removes the physical failure mode entirely. This is the arrangement most experienced travelers end up on after one bad card.
• Ask the shop that sold it. If the shop is still there and still answers, sometimes they can help. If you bought it in Hanoi and you are now in Da Nang, this is not an option.

The lesson is not that physical cards are unreliable. It is that the registration determines what support you can get, and the registration is decided in about ninety seconds at the counter. Ask for the slip.

When is the airport counter the right answer anyway?

The airport premium is worth paying in two situations, and it is worth being honest that both are real.

You need a voice-capable number within the hour. A hotel booking that needs a local number, a delivery, a tour operator who will only call. No eSIM solves this, and the city shop is another hour away with your bags.

Your phone cannot take an eSIM, and you did not buy a card in advance. Then the airport is not a premium, it is the only option that does not involve leaving the terminal.

A third case that is often claimed and rarely true: “I want to be sure it works before I leave the airport”. An eSIM installed at home with a free trial proves the same thing a week earlier, and proves it about your actual handset rather than about a card in a plastic frame.

Landing at eleven at night in Ho Chi Minh City

The late arrival is the scenario where the decision was made days earlier, in your favor or against you.

If you have an eSIM installed and switched off, the phone connects within a minute of landing, before the immigration queue clears. You can message whoever is meeting you, price a Grab and pull up the hotel address while you are still in the baggage hall. That is the entire benefit, and it costs nothing extra.

If you have not, the sequence is immigration, baggage, the SIM counters, a queue, a form, a passport photograph, and a taxi. At eleven at night that is an hour you will remember.

There is a middle path worth knowing: the airport’s free Wi-Fi is good enough for the first ten minutes, which is enough to book a Grab and confirm your hotel without buying anything at all. Several travelers use it to reach the city, buy a card downtown the next morning at half the price, and never touch an airport counter. It works. It just requires you to arrive with a plan rather than a hope.

What to keep after it works

Four things, photographed and stored in your phone’s notes:

The registration slip. Your passport number against the line. The single most useful document if anything goes wrong.

The card itself, including the plastic frame. The frame carries the ICCID and often the PUK code, and the PUK is what unlocks a card that has been blocked by too many wrong PIN entries.

The expiry date and the package name. Vietnamese prepaid cards expire, and a card that lapses can take the number with it.

The APN string, if you had to enter it manually. If you change phones or reset network settings, you will need it again.

For an eSIM the equivalent list is shorter: the order confirmation, the QR code email, and a note of the plan’s expiry. Our guide to moving an eSIM between phones covers the cases where a working profile stops working after a device change.

Viettel, Vinaphone and MobiFone: the cheapest card quietly picks a network for you

Vietnam has four networks and one of them is materially better outside the cities. That single fact reorders almost every price comparison in this guide, because the cheapest tourist card is usually the one tied to whichever operator gave the reseller the best wholesale rate.

Viettel is the largest and the one that matters for anyone leaving the cities. It built out the northern mountains and the central highlands, which is why it is the network people recommend for Sapa, Ha Giang and the roads around Da Lat. Vinaphone and MobiFone are close behind in the lowlands and along the coast, and perfectly good if your trip is Hanoi, Da Nang, Hoi An and Ho Chi Minh City. Vietnamobile is cheaper and thinner, and it is the one to avoid if your itinerary leaves the delta.

Two consequences follow for a purchase decision, and they point at different products.

If you are buying a travel eSIM, the product page may or may not name the network partner. When it does, check it against the table above. When it does not, and your trip includes the north, treat the silence as a reason to ask rather than a detail to discover in Sapa.

If you are buying a local card, the cheap card in the convenience store is often a Vietnamobile or a resold bundle on the network the shop gets the best margin on. That is fine in Ho Chi Minh City and a genuine problem in Ha Giang. Ask which network the card rides before you pay — it is a normal question and the shop assistant will know the answer immediately.

Hanoi, Da Nang, Ho Chi Minh City and Phu Quoc: four different coverage stories

Vietnam is long and thin, and the four places most visitors go behave differently enough that a single “coverage is fine” verdict is misleading.

Ho Chi Minh City is the easiest. Coverage is dense across Districts 1, 3 and 7, holds in the tunnels and underpasses, and the only congestion is around Ben Thanh at rush hour. If your trip starts and ends here, almost any product works.

Hanoi is nearly as good but has a specific weakness: the Old Quarter’s narrow tube houses block signal at street level in a way that open cities do not, and a phone can show two bars and no throughput in a café. It is a building-density problem, not a network problem, and walking to the end of the street usually solves it.

Da Nang and Hoi An are well covered on the coast and thin out quickly inland, particularly on the Hai Van Pass and the roads toward Ba Na. The beach strip is fine; the mountain road above it is not.

Phu Quoc is good in Duong Dong and along the main beach roads, and patchy on the northern and eastern coasts where the resorts are newer than the infrastructure. Boats to the smaller islands lose signal within minutes of leaving the harbour.

The Ha Long case deserves a sentence of its own because it inverts the usual advice. A day or overnight cruise spends hours on water where there is no cell at all, and the boats that advertise Wi-Fi are advertising a satellite link shared by a hundred passengers. Download everything before boarding, treat the cruise as offline time, and do not buy a larger plan to solve a problem that a larger plan cannot solve.

The rainy season, and the month the cell site is the least of your problems

Southern Vietnam is wet from roughly May to November, the centre from September to December, and the north in the summer months. The rain itself does not stop a mobile network. What stops it is what the rain does to the power.

In a heavy monsoon week, the failure pattern is consistent: local power cuts, cell sites running on battery, and data that gets slower through the afternoon before it disappears. The sites that stay up are the ones with generators, and those are concentrated where the customers are — which is not the village you have cycled to.

What to do about it is modest and specific:

• Charge in the morning, when power is most likely to be on, rather than assuming the evening will work.
• Keep a power bank, and treat a full one as part of the day’s kit in July and August.
• Send text before photos. Messages route over the control channel and get through on a signal that will not carry an image, which is the same behaviour the Mexico hurricane section describes.
• Expect the hotel Wi-Fi to be down at the same time, because it usually is: same power, same building.

The one route where this changes an itinerary rather than an evening is the northern loop. Landslides close the Ha Giang roads in the wet season, and the announcement is made locally rather than online, so a working phone is less useful than asking at the guesthouse. That is a rare case where the offline answer beats the connected one.

Crossing to Cambodia or Laos overland: where a Vietnamese card dies

Vietnam has three land borders that visitors actually use: Moc Bai to Cambodia, Lao Bao and Cau Treo to Laos, and the northern crossings into China. Each one ends a Vietnamese card’s usefulness in a different way.

A Vietnamese prepaid tourist card generally does not include roaming into Cambodia or Laos, and where it does, the rate is high enough that a day of maps costs more than a new card. This is not a technicality on a two-week route: the classic overland itinerary is Ho Chi Minh City to Phnom Penh by bus, and it crosses at Moc Bai in the middle of a travel day, which is the worst possible moment to discover the plan has stopped.

The alternative that avoids all four rows is a regional Southeast Asian eSIM, which covers Vietnam, Cambodia, Laos and Thailand on one profile with one data pool. It costs more per gigabyte than a Vietnam-only plan and less than buying three cards at three borders, and the break-even is roughly two countries — which is exactly why the Vietnam, Cambodia and Thailand comparison exists as its own page.

The mistake to avoid is buying a Vietnam-only plan for a route that ends in another country because the plan was cheaper at the point of purchase. The saving is a few dollars; the cost is a border crossing with no data and a bus that is not waiting.

FAQ

Is a Vietnam SIM card cheaper than an eSIM? For a month of heavy data, yes, a city-shop card usually wins on raw gigabytes. For a one or two-week trip it usually loses, because the eSIM starts at $1.99 and needs no queue, no passport form and no top-up trip.

Can I buy a Vietnam SIM card at the airport with a credit card? Usually yes at the carrier counters, less reliably at reseller stands. Cash in dong is accepted everywhere and avoids a card surcharge, and there are ATMs and exchange desks in the arrivals hall before the counters.

Do I need a Vietnamese ID to buy a SIM card? No. A passport is enough for a tourist or prepaid line, and the registration is completed at the counter. What a passport does not get you is a line that passes bank or government verification, which needs a residence document.

How much data does a thirty-day tourist card include? Common packages run from 30GB to 60GB over thirty days, often split into a daily high-speed allowance. Read the daily figure rather than the headline number, because a card advertised as unlimited with a 2GB daily cap behaves like a 60GB card with an evening throttle.

Can I keep the number after I leave Vietnam? Only while the card stays charged and registered. Prepaid numbers are reclaimed after a period of inactivity, and a bulk-registered tourist card may be cut sooner. If the number matters to you, keep it topped up and keep the registration slip.

Does a Vietnamese SIM card work in Cambodia or Thailand? Not on a domestic prepaid tariff. Vietnamese prepaid cards are not sold with regional roaming included, so the card stops working at the border. A regional Asia eSIM is the alternative, and the three-country guide does the arithmetic.

What if my flight lands after the SIM counters close? At Tan Son Nhat and Noi Bai the carrier desks keep long hours and usually match the last arrival bank, but the reseller stands close earlier. If everything is shut, use the airport’s free Wi-Fi to book a ride and sort a card the next morning in town, where the price is lower anyway.

Can I buy a Vietnam SIM card at a land border? Sometimes, from touts, at a price that reflects the lack of alternatives and with no registration slip worth keeping. Buy before you reach the border, or cross with an eSIM already installed.