 To dial a number within the same province or city, only the phone number needs to be dialed.When dialing from a different province/city, follow the format 0 + Area Code + Phone Number.At the moment, area codes may have from 2 to 3 digits, while phone numbers may have from 7 to 8 digits, in total, the land line phone numbers in Vietnam have 11 numbers included trunk code (0).