City Name / Region National Dialing Format International Dialing Format
Hung Yen0 (321) 2XXXXX+84 (321) 2XXXXX
Hung Yen0 (321) 4XXXXX+84 (321) 4XXXXX
Hung Yen0 (321) 5XXXXX+84 (321) 5XXXXX
Hung Yen0 (321) 6XXXXX+84 (321) 6XXXXX
Hung Yen0 (321) 7XXXXX+84 (321) 7XXXXX
Hung Yen0 (321) 8XXXXX+84 (321) 8XXXXX
Hung Yen0 (321) 9XXXXX+84 (321) 9XXXXX