City Name / Region National Dialing Format International Dialing Format
Hai Duong0 (320) 2XXXXX+84 (320) 2XXXXX
Hai Duong0 (320) 4XXXXX+84 (320) 4XXXXX
Hai Duong0 (320) 5XXXXX+84 (320) 5XXXXX
Hai Duong0 (320) 6XXXXX+84 (320) 6XXXXX
Hai Duong0 (320) 7XXXXX+84 (320) 7XXXXX
Hai Duong0 (320) 8XXXXX+84 (320) 8XXXXX
Hai Duong0 (320) 9XXXXX+84 (320) 9XXXXX