Which operator should you choose?
There is no single best operator for the entire country. If you stay in one major city, signal quality around your home and workplace matters most. If you travel across regions, coverage outside tourist centres matters more. Viettel, VinaPhone, and MobiFone are the large networks, so compare coverage and package terms rather than just the marketing name.
| Scenario | What to check |
|---|---|
| 7-14 day holiday | Simple tourist/data package, enough data, minimal setup |
| 1-3 month stay | Easy package renewal and balance top-up without visiting a shop |
| Travel around Vietnam | Coverage on your route, not just speed in city centres |
| Working from your phone | High-speed data allowance, hotspot/tethering, and stability where you stay |
Where to buy a SIM
- An operator-branded store is the best option if you need a normal local number for longer use.
- An official airport tourist counter is convenient after arrival, but compare package length and data before paying.
- An operator's official online tourist channel can work if advance SIM/eSIM registration is supported.
A random street seller may still provide a working SIM, but check that the number is correctly registered and that the actual package matches what was promised. For long-term use, this matters more than saving a small amount of money upfront.
Why a passport is required
A SIM is not simply an anonymous piece of plastic. Official tourist channels request passport information, and some may also ask for a portrait or identity-verification photo. Viettel's tourist portal, for example, includes passport and portrait uploads in its registration flow.
What to check before leaving the counter
- Your phone connects to the network and mobile data works with Wi‑Fi turned off.
- You know your local phone number.
- You understand the package validity: 7, 10, 30 days, or another period.
- You know the high-speed data allowance and what happens after it is used.
- You know how to top up or renew the package.
- The SIM is registered to your identity if you plan to keep the number.
Physical SIM or eSIM?
If your phone supports eSIM, it is convenient for a short trip because you can keep your primary SIM in the device and use the second line for Vietnam data. A physical SIM can be simpler for older phones, long-term local-number use, or when you prefer in-person support at an operator store.
Questions and answers
Which mobile operators are available in Vietnam?
For most visitors, the main choices are Viettel, VinaPhone, and MobiFone.
Do I need a passport to buy a SIM card?
Passport details are normally required for official registration of a tourist SIM.
Can I buy a SIM at the airport?
Yes, but check the operator, package duration, and renewal conditions.
Which is better: SIM or eSIM?
For a short trip, eSIM is often more convenient. For a long-term local number, a physical SIM remains practical.