City Name / Region National Dialing Format International Dialing Format
Hanoi0 (4) 2XXXXXX+84 (4) 2XXXXXX
Hanoi0 (4) 4XXXXXX+84 (4) 4XXXXXX
Hanoi0 (4) 5XXXXXX+84 (4) 5XXXXXX
Hanoi0 (4) 6XXXXXX+84 (4) 6XXXXXX
Hanoi0 (4) 7XXXXXX+84 (4) 7XXXXXX
Hanoi0 (4) 8XXXXXX+84 (4) 8XXXXXX
Hanoi0 (4) 9XXXXXX+84 (4) 9XXXXXX