Best eSIM for Vietnam (2026): Tested Options and Gotchas
The honest, been-there guide to data in Vietnam: whether an eSIM works, the gotchas nobody warns you about, and the one I use now (from $4).
Key takeaways
- Sort data before you fly and you walk out of the airport in Vietnam already online, no counter queue.
- Your phone must be eSIM-capable and carrier-unlocked, and an eSIM is data-only, so keep your normal SIM for calls and OTP texts.
- Install it before you leave home; some countries let you activate on landing, strict ones need full setup before arrival.
- The one I use (Fizen) starts at $4, covers 150+ countries, pays via USDT, Stripe, Apple Pay or Google Pay, with real one-to-one support if it ever fails.
Which network you get, and what it really costs
In Vietnam the Fizen eSIM roams on Viettel Mobile (4G). Vietnam is sold inside the South-Eastern Asia plan, which covers 18 countries. At 128 kbps you can still send messages and load map tiles, but not hold a video call.
| Plan | Days | Price | Per day | Per GB | After the high-speed data |
|---|---|---|---|---|---|
| 1 GB | 3 | US$9.94 | US$3.31 | US$9.94 | slows to 128 kbps |
| 5 GB | 7 | US$16.68 | US$2.38 | US$3.34 | slows to 128 kbps |
| 5 GB | 15 | US$17.35 | US$1.16 | US$3.47 | slows to 128 kbps |
| 5 GB | 30 | US$18.36 | US$0.61 | US$3.67 | slows to 128 kbps |
| 10 GB | 7 | US$23.52 | US$3.36 | US$2.35 | slows to 128 kbps |
| 10 GB | 15 | US$24.55 | US$1.64 | US$2.46 | slows to 128 kbps |
| 10 GB | 30 | US$25.60 | US$0.85 | US$2.56 | slows to 128 kbps |
| 20 GB | 15 | US$39.00 | US$2.60 | US$1.95 | slows to 128 kbps |
| 20 GB | 30 | US$40.07 | US$1.34 | US$2.00 | slows to 128 kbps |
| 50 GB | 30 | US$79.74 | US$2.66 | US$1.59 | slows to 128 kbps |
Prices and carrier read from the Fizen catalogue on 23 September 2026. Data only, no calls or SMS.
Prices are before the welcome credit. A new user who opens the eSIM tab in the Fizen app for the first time gets US$10 of eSIM credit automatically, with no code, valid for 12 months. The app shows how much of it comes off your order. Paying by card on the web works too, but the credit only applies in the app.
My first hour in Hanoi I stood on a corner watching a thousand motorbikes flow past and realised my 'grab a SIM later' plan meant I couldn't call a Grab, map my way anywhere, or tell my hotel I was hopelessly lost. The Old Quarter is not the place to be offline and guessing which alley you came from.
New to Fizen? Open the eSIM tab in the Fizen app and $10 of eSIM credit is added automatically. New accounts only, while the campaign runs. Claim it here →
Roaming, local SIM, or eSIM? What I'd tell a friend
Over a ca phe sua da: roaming stings, a local Viettel SIM is genuinely excellent and cheap but means the counter and your passport, and an eSIM skips straight past that. Set it up before you fly, keep your normal number for the bank texts, walk out connected.
Does an eSIM actually hold up in Vietnam?
Excellent, and it feels almost too cheap to be this good. Viettel and friends blanket the cities, the coast and the big sights, Ha Long, Da Nang, Hoi An, plus a lot of the countryside. Vietnam is one of the easiest places in the region to stay connected.
The eSIM gotchas nobody warns you about
A few things I wish someone had told me before my first eSIM, so you can skip the learning curve:
- Your phone must be ready: it has to be eSIM-capable and carrier-unlocked. A phone still locked to a home contract will refuse a travel eSIM, and some models sold in one region ship with eSIM crippled, so check yours before you pay.
- It is data-only: the eSIM gives you internet, not a local number. Keep your normal SIM in for calls and the two-factor codes your bank loves to text.
- Install before you fly: download the eSIM on home Wi-Fi, not in an airport queue. Vietnam is easy: install at home and switch on when you land.
- Check hotspot if you tether: if you run a laptop off your phone, confirm the plan allows hotspot. Some 'unlimited' plans quietly throttle or block it.
Easy until it isn't
Vietnam is easy, but easy still fails at the worst moment, mine was a dead SIM at midnight in a Sapa homestay with no Wi-Fi and a 5am bus to catch. That's when you learn the value of a provider you can actually reach. With Fizen, failures are rare, but if one lands you get a one-to-one replacement and a real person who answers, instead of a form that emails you back once you're already home.
What I use, and what it costs
None of this matters if the plan is a rip-off, so plainly: a Fizen eSIM starts at $4, and the same one works in 150+ countries, so I stopped re-buying an app for every trip. You pick a daily 1GB, 3GB or 5GB plan for a short stay, or go unlimited if you are working off it. You can pay with USDT, or by card through Stripe, Apple Pay or Google Pay, so there is no local bank card and no foreign-transaction fee in the way.
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