2. Can you buy a SIM card with a French passport?

Yes.

A foreigner can register a line with their passport.

Identifying the owner of the line is important in Vietnam. Operators are strengthening their subscriber verification procedures. In 2026, new authentication measures were introduced to combat incorrectly registered SIMs and fraud.

For example, MobiFone allows the use of a passport in its registration and eSIM procedures.

Vietly Tip:

Buy your SIM at:

an official Viettel, VinaPhone, or MobiFone store

rather than at a small tourist shop.

This way, you will have much less risk of having a SIM registered in someone else's name.