Area Code +84-31-(6000000...6999999) located in Hai Phong, more detail is as below. Place International Dialing Code : 84 International Prefix : 00 National Prefix : 0 National Destination Code : 31 Subscriber Number From : 6000000 Subscriber Number To : 6999999 National Destination Code Length : 2 Uses National Destination Code : Yes National Significant Number Length : 9 Number Type : G (Geographic Land Line, Fixed Line) Carrier Name : Viettel Click here to buy Vietnam Area Code Database Other Information Language Code : vi (Vietnamese) Country Number : 704 (Vietnam) Country Code : VN (Vietnam) City : Hai Phong Timezone : Asia/Ho_Chi_Minh Coordinated Universal Time : +07:00 Daylight Saving Time : No National Significant Number Minimum Length : 9 Latitude : 20.2500 Longitude : 105.9700 ‹ previous : +84-188-(0000000...9999999) next › : +84-320-(0000000...9999999) Dialling Instructions For trunk calls: 0 31 6000000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 00 84 31 6000000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 6000000 ~ 6999999 (Count: 1,000,000) Example: +84-31-6000000 / 0084-31-6000000 (031-6000000 / 0-31-6000000) +84-31-6000001 / 0084-31-6000001 (031-6000001 / 0-31-6000001) +84-31-6000002 / 0084-31-6000002 (031-6000002 / 0-31-6000002) +84-31-6000003 / 0084-31-6000003 (031-6000003 / 0-31-6000003) +84-31-6000004 / 0084-31-6000004 (031-6000004 / 0-31-6000004) ...+84-31-xxxxxxx / 0084-31-xxxxxxx (031-xxxxxxx / 0-31-xxxxxxx) ...+84-31-6999995 / 0084-31-6999995 (031-6999995 / 0-31-6999995) +84-31-6999996 / 0084-31-6999996 (031-6999996 / 0-31-6999996) +84-31-6999997 / 0084-31-6999997 (031-6999997 / 0-31-6999997) +84-31-6999998 / 0084-31-6999998 (031-6999998 / 0-31-6999998) +84-31-6999999 / 0084-31-6999999 (031-6999999 / 0-31-6999999)