What a Viettel monthly 4G plan actually is
Viettel sells prepaid mobile packages under codes such as V90B, ST90K and similar. A monthly plan is a bundle: you pay once, and for the next 30 days you get a set data volume, sometimes with calls or SMS included. The plan is attached to a Vietnamese SIM card, which means a Vietnamese phone number, registration in the carrier's system, and a top-up cycle you have to manage.
That is fine if you live in Vietnam or stay long enough to justify it. It is usually the wrong tool for a two-week holiday.
What to check before you buy a monthly Viettel plan
If you are comparing plans for a Vietnamese SIM, these are the fields that matter:
| What to check | Why it matters |
|---|---|
| Plan code | Viettel sells several near-identical codes; the code is what the shop or app will ask for |
| Data allowance | Some plans are daily-capped, some are a monthly bucket |
| Validity | 30 days is standard, but renewal dates and grace periods differ |
| Network | Viettel is one of Vietnam's three main networks; coverage varies by region |
| Registration | A Vietnamese SIM needs ID registration, which is why visitors often cannot simply buy one |
| Top-up | You need a way to pay in VND, usually via a Vietnamese bank or scratch card |
For a fuller picture of how Viettel compares with VinaPhone and MobiFone, see Viettel, VinaPhone or MobiFone: how Vietnam's three networks compare.
Why most travellers should not buy a monthly Viettel plan
A monthly plan assumes you have a Vietnamese SIM. Getting one means going to a Viettel store, presenting a passport, and registering the number. That can take an afternoon you would rather spend elsewhere, and the plan then runs on a 30-day cycle that will not match a 10-day trip.
A travel eSIM skips all of that. You install it before you fly, it connects when you land, and you pay in USD for exactly the number of days you need. The data runs on a Vietnamese network, so you get the same coverage without the registration queue.
If you want to understand the difference in more detail, Pocket Wi-Fi or eSIM for your trip to Vietnam? walks through the trade-offs, and Vietnam eSIM Activation: How to Install, Activate on Landing and Fix First-Connection Problems covers the setup step by step.
What to buy instead: the VietSIM Vietnam eSIM
The VietSIM Vietnam eSIM is the plan this page exists to sell. It is a prepaid data eSIM for Vietnam, bought online in USD, installed by QR code, and active on landing. You keep your home SIM in the phone for calls and bank codes, and the eSIM handles data.
Buy it here: Vietnam eSIM store.
Before you buy, check two things:
- Phone compatibility. The phone must be eSIM-capable and carrier-unlocked. The Vietnam eSIM for iPhone and Vietnam eSIM for Android guides list the models that work.
- Data volume. A short city trip uses far less than a trip with hotspot tethering or lots of video. If you plan to share the connection, read Vietnam eSIM as a Hotspot: Tethering Rules and How Much Data It Eats first.
If you are staying long enough to want a local plan
Staying three months or more, or living in Vietnam? Then a Vietnamese SIM with a monthly plan can make sense. Compare the three networks before you commit, and check whether the plan you want is sold in a store or only through the carrier's app. The plan codes are quoted exactly as they are sold, so write the code down before you go.
For shorter stays, the eSIM remains the simpler answer, and it is the one this site sells.