Area Code +84-231-(4000000...4999999) located in Lai Chau, more detail is as below. Place International Dialing Code : 84 International Prefix : 00 National Prefix : 0 National Destination Code : 231 Subscriber Number From : 4000000 Subscriber Number To : 4999999 National Destination Code Length : 3 Uses National Destination Code : Yes National Significant Number Length : 10 Number Type : G (Geographic Land Line, Fixed Line) Carrier Name : VTC Click here to buy Vietnam Area Code Database Other Information Language Code : vi (Vietnamese) Country Number : 704 (Vietnam) Country Code : VN (Vietnam) City : Lai Chau Timezone : Asia/Ho_Chi_Minh Coordinated Universal Time : +07:00 Daylight Saving Time : No National Significant Number Minimum Length : 10 Latitude : 22.3100 Longitude : 102.6200 ‹ previous : +84-231-(3000000...3999999) next › : +84-231-(6000000...6999999) Dialling Instructions For trunk calls: 0 231 4000000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 00 84 231 4000000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 4000000 ~ 4999999 (Count: 1,000,000) Example: +84-231-4000000 / 0084-231-4000000 (0231-4000000 / 0-231-4000000) +84-231-4000001 / 0084-231-4000001 (0231-4000001 / 0-231-4000001) +84-231-4000002 / 0084-231-4000002 (0231-4000002 / 0-231-4000002) +84-231-4000003 / 0084-231-4000003 (0231-4000003 / 0-231-4000003) +84-231-4000004 / 0084-231-4000004 (0231-4000004 / 0-231-4000004) ...+84-231-xxxxxxx / 0084-231-xxxxxxx (0231-xxxxxxx / 0-231-xxxxxxx) ...+84-231-4999995 / 0084-231-4999995 (0231-4999995 / 0-231-4999995) +84-231-4999996 / 0084-231-4999996 (0231-4999996 / 0-231-4999996) +84-231-4999997 / 0084-231-4999997 (0231-4999997 / 0-231-4999997) +84-231-4999998 / 0084-231-4999998 (0231-4999998 / 0-231-4999998) +84-231-4999999 / 0084-231-4999999 (0231-4999999 / 0-231-4999999)