SIM card & eSIM in Vietnam (2026)

You want mobile data from the minute you arrive. Grab (the local ride app), Google Maps, Google Translate and QR-code payments all lean on it, and the airport WiFi rarely stretches to the taxi rank. Two options do the job for foreigners: an eSIM you switch on the moment you land, or a physical SIM from an operator counter. This guide sticks to those — for café WiFi, home fibre and VPNs, see the separate internet in Vietnam guide.

eSIM or physical SIM? The quick answer

Both give you the same networks and the same speed. The choice comes down to how long you're staying and whether you need a Vietnamese phone number.

• Short trip, want data on landing: buy an eSIM before you fly. No counter, no queue, no passport step, and your home number stays live for bank codes.
• A month or more, cheapest data, a local number:pick up a physical Viettel or Vinaphone SIM at the airport. It's a few dollars for a month of daily data, and the number lets you use Grab, food delivery and bookings.

Mobile data speed and 5G

Vietnam ranks in the top five in Southeast Asia for mobile speed. Per Ookla Speedtest (Q1 2026), the average mobile download speed is around 90–100 Mbps — on par with South Korea and Singapore. 4G reaches ~99% of populated areas, and 5G is already live in Hanoi, Ho Chi Minh City, Da Nang, Nha Trang, Hai Phong and Can Tho. In practice you rarely think about the signal at all.

Out in the countryside and the mountains — Sa Pa, Ha Giang, the Mekong Delta — 4G still works, but the signal thins out and only Viettel holds steady off the main roads. If your trip goes genuinely remote, that alone is a reason to pick Viettel.

Mobile operators in Vietnam

There are four operators. All sell tourist SIMs with big data bundles; they differ in coverage, speed and price.

Viettelis the market leader and reaches even Sa Pa's mountains and remote islands — pick it if you're covering the whole country. Vinaphone is marginally faster in Hanoi and Ho Chi Minh City, 10–15% cheaper, and great for city breaks and the coast. Mobifone is fine in the main tourist zones. Vietnamobile is the cheapest but city-only — signal vanishes once you ride out of town.

Tourist SIM plans & prices

Every operator sells prepaid tourist bundles with big daily data caps. Prices below are current for 2026, in VND with an approximate USD conversion at ~26,000 VND to $1.

"3 GB/day" means the fast-data cap resets every morning — plenty for maps, calls, streaming and tethering a laptop. For a 2–4 week trip the 6 GB/day month plan is the sweet spot; you almost never need more.

Mobifone plans

Mobifone counts data differently: its tourist bundles give you a total allowance for the whole period rather than a daily cap, so heavy streaming burns through them faster than the number suggests.

These are sold through the Hi Vietnam app, which runs an eKYC check — a short video call against your passport. Fine if you have data already; awkward as your very first step off the plane.

Topping up

Four ways to add credit, in rough order of how often travellers use them:

• Scratch card. Sold in mini-markets, corner shops and petrol stations for 10,000–500,000 VND. Scratch off the panel and enter the code via USSD. No app, no card, no Vietnamese needed.
• Operator app. My Viettel, My VNPT or My MobiFone take Visa and Mastercard.
• Mini-market counter. Circle K, FamilyMart and GS25 will top up the number for you at the till.
• Vietnamese bank app.Only relevant if you've opened a local account — see the bank account guide.

USSD codes worth saving

These work on any handset, with no app and no signal-hungry data connection — useful when a bundle runs out at the worst moment.

Prices are current as of July 2026. Check the operator's own site before you travel — bundles change often.

eSIM — get online before you land

If your phone supports eSIM (most recent iPhones and flagship Androids do), this is the smoothest option: buy a Vietnam plan online, install it before departure and switch it on when you land. Providers like Airalo, Saily and Holafly run on Viettel or Vinaphone under the hood, so coverage matches a local SIM.

To activate: buy the plan, get a QR code by email, then on your phone go to Settings → Cellular → Add eSIM and scan it. Set the new plan for data and keep your home SIM for calls and texts.

• Upside: data the second you land, home number stays active, and there's nothing to lose or forget at a counter.
• Downside: a bit pricier per GB than a local SIM, and most eSIMs are data-only — no Vietnamese number. Airalo's 10 GB month is ~$16, versus ~$8 for a local SIM with 6 GB a day.

Where to buy a SIM (and the passport rule)

• Airport counters (fastest). Viettel, Vinaphone and Mobifone have staffed desks in the arrivals hall, open 24/7. Staff register the SIM to your passport, set the data and check it works. The catch: prices run 20–30% above a city shop.
• Official operator stores. The cheapest prices and the full plan range, found in every town — handy if you want to top up or switch plans later.
• Skip unregistered street SIMs.They're often sold without your passport, registered to someone else, and can be cut off without warning.

Roaming from your home carrier

Home-carrier roaming works everywhere but is the most expensive way to get data by a wide margin — often 10–50 times the price of a local SIM or eSIM. Keep your home number switched on for one thing only: bank SMS and two-factor codes. For actual internet, use an eSIM or local SIM. If you must roam for the first hour, buy your carrier's travel day-pass rather than paying per megabyte.

Phone code & dialing (+84)

Vietnam's country code is +84. To call a Vietnamese mobile from abroad, dial +84 then the number without its leading zero (local 090 123 4567 becomes +84 90 123 4567). Local mobile numbers have 10 digits and start with 0. Emergency numbers: 113 police, 114 fire, 115 ambulance.

Number prefixes and operator hotlines

The first three digits tell you which network a Vietnamese number is on — handy when a driver or host gives you a number and you want to know whether calling them is on-net, or when you need to reach your own operator.

Common mistakes to avoid

• Leaving home roaming on by accident and coming home to a huge bill.
• Buying an unregistered street SIM that gets blocked days later.
• Overbuying data — a 3 GB/day plan is more than enough for most trips.
• Choosing Vietnamobile for a trip around the country; ride out of the city and the signal disappears.
• Expecting an international eSIM to give you a Vietnamese number (it won't).
• Forgetting a VPN if you rely on Telegram, and skipping Zalo — it's how a lot of local businesses talk to you.

FAQ