What V90B actually is
V90B is a plan code from Vietnam's mobile plan catalogue (goi cuoc) — the kind of package a Vietnamese subscriber selects from their carrier's menu. Codes like this are how Vietnam's carriers sell prepaid bundles domestically: you top up your balance, pick a code, and the carrier applies the allowance to your SIM.
Two things follow from that, and both matter if you found this page while planning a trip:
- V90B is sold inside Vietnam, to Vietnamese SIM holders. It is not listed on international eSIM storefronts and it is not something you can purchase from abroad as a traveller.
- The plan code is quoted exactly as the carrier sells it. If you are comparing plans as a Vietnamese subscriber, the code is the identifier you use. If you are a visitor, the code is not your route to data.
This page is informational. It does not sell V90B, and it does not claim any coverage, speed or activation detail beyond what the plan's product record states.
Why travellers keep landing on plan codes
Vietnam's mobile market is unusually well documented in Vietnamese, and search engines happily surface carrier plan pages to anyone typing a code. The result is a steady stream of visitors who searched a plan code, landed on a Vietnamese-language carrier page, and came away unsure whether they had found a travel product.
They had not. Domestic prepaid plans and travel eSIMs are two different products with two different buyers:
| Domestic prepaid plan (e.g. V90B) | Vietnam travel eSIM | |
|---|---|---|
| Who buys it | Vietnamese subscribers | Inbound travellers |
| Where you buy it | In Vietnam, from the carrier | Online, before you fly |
| When it works | After local purchase and activation | On landing, once the eSIM connects |
| Typical use | Monthly bundles, data add-ons | Trip-length data for one visitor |
| Language of sale | Vietnamese | 18 interface languages |
If you are a Vietnamese reader comparing plans, the catalogue is where the codes live. If you are a traveller, the table above is the whole answer: you want the right-hand column.
What a traveller should buy instead
The VietSIM store sells prepaid Vietnam eSIMs built for visitors: you buy online, install the eSIM before departure, and it activates when your phone connects to a network in Vietnam. That is the product this site exists to sell, and it is one click away:
Buy the Vietnam eSIM in the store
Before you buy, two checks save most of the support tickets:
- Phone compatibility. Your handset must support eSIM and be carrier-unlocked. The Vietnam eSIM for iPhone and Vietnam eSIM for Android guides walk through the model-level detail.
- How much data you need. A short city break and a two-week north-to-south trip are different purchases. The Vietnam eSIM price guide explains what moves the price, and Vietnam eSIM Unlimited explains what "unlimited" does and does not mean.
If you are a Vietnamese subscriber comparing plans
Plan codes like V90B belong to the carrier's own catalogue, and the catalogue here is informational: it lists plans as they are sold, with codes quoted exactly. It is not a top-up service, and this site does not run its own carrier top-up inventory. To buy or change a domestic plan, you go through your carrier's own channels — the code is simply how you name the package you want.
If you are comparing carriers rather than codes, Viettel, VinaPhone or MobiFone sets out how the three networks differ, and 5G in Vietnam covers where the newer generation actually reaches.
Common confusions around plan codes
"Can I buy V90B as an eSIM?" No. V90B is a domestic prepaid plan code, not an eSIM product sold to visitors. Travel eSIMs are a separate purchase, made online before you fly.
"Will a plan code work in my phone when I land?" Only if you already hold a Vietnamese SIM with that plan applied. A visitor arriving with no local SIM has nothing for the code to attach to.
"Do I need a Vietnamese phone number?" Not for data. A data eSIM gets you online without one; if you specifically need a number for calls or local registrations, read Does a Vietnam eSIM come with a phone number? first.
"What if I already bought an eSIM and lost the email?" There is no public order lookup page — per-order links arrive by email. If yours is missing, the help centre can point you to the right next step.
The short version
V90B is a Viettel prepaid plan code for the Vietnamese market. It is useful if you are a subscriber choosing a bundle; it is not a travel product. If you are flying to Vietnam, buy a Vietnam eSIM before you leave, install it at home, and let it activate when you land — that is the purchase this page is pointing you towards.