How do you get a mobile phone number in Vietnam in 2026?

The three national carriers are Viettel, Vinaphone (VNPT), and Mobifone. Official stores at Tan Son Nhat in Ho Chi Minh City, Noi Bai in Hanoi, and major malls give clearer registration than random street resellers. Ask for a tourist or prepaid pack with the data volume you need, then complete subscriber registration with your passport under Decree 49/2017 rules on mobile-subscriber management.

Staff photograph the passport data page and link the SIM to your identity. Keep the registration receipt or confirmation SMS. If a reseller sells an already-activated card without your passport on file, replace it at an official shop before you rely on the number for banking.

When you open a bank account, branches commonly ask for a local phone and may send OTPs to that line. Payroll apps, e-wallet KYC, and some immigration or e-visa checks also assume a reachable Vietnamese mobile contact.

Use the same number on your lease, employer HR file, and bank KYC so ward police tạm trú reports and bank records do not contradict each other: Register temporary residence.

Viettel often has the broadest rural and highway coverage if you travel to Sapa, Phong Nha, or Mekong Delta routes. Vinaphone and Mobifone compete strongly in Hanoi and Ho Chi Minh City urban cores. Test signal in your actual apartment before committing to a long top-up if you live in a high-rise canyon or coastal ward.

For home broadband, treat mobile data and fibre as separate decisions: Utilities, internet, and transport.