+84 is the country code for Vietnam.

Mobile numbers in Vietnam start with 12, 16, 3, 51, 52, 55, 56, 58, 59, 70, 76, 77, 78, 79, 81, 82, 83, 84, 85, 86, 87, 88, 89 or 9, and this table shows which networks first issued each start.

People keep their number when they switch networks, so the start shows where a number began. Our free number portability lookup shows the network it is on today.

Landline area codes in Vietnam start with 024 for Hanoi City, and the table lists 60 of the places they cover.

Showing 60 of 63 area codes.

In Vietnam, the phone number format for apps and SMS gateways is +84 followed by the number without its 0.

A missed call from a +84 number you don't know can be a one-ring scam, so check it before calling back.

One-ring scams call once and hang up, hoping you call back a line that bills you international or premium rates.

1. Don't call back an international number you don't know. A real caller leaves a message or sends a text.
2. Check the number in the box above. A number that is not a working mobile or landline in Vietnam is a warning sign.
3. Hang up on anyone who wants gift cards, crypto or a wire transfer, or asks you to read out a code that was just texted to you.
4. Report it at reportfraud.ftc.gov, and see the FCC's guide to one-ring scams.

The codes next to +84 belong to other countries, so one wrong digit reaches a different place.

See every country code

These are the questions people ask most about +84.

Sources: Google's libphonenumber numbering data for lengths, mobile starts, area code places, first-issuing networks and time zones, as of September 24, 2026; the ITU list of country codes.