Area Code +856-21-(630000...639999) located in Vientiane, more detail is as below. Place International Dialing Code : 856 International Prefix : 00 National Prefix : 0 National Destination Code : 21 Subscriber Number From : 630000 Subscriber Number To : 639999 National Destination Code Length : 2 Uses National Destination Code : Yes National Significant Number Length : 8 Number Type : G (Geographic Land Line, Fixed Line) Carrier Name : Laotel Click here to buy Laos Area Code Database Other Information Language Code : lo (Laothian) Country Number : 418 (Laos) Country Code : LA (Laos) City : Vientiane Timezone : Asia/Vientiane Coordinated Universal Time : +07:00 Daylight Saving Time : No National Significant Number Minimum Length : 8 Latitude : 17.9600 Longitude : 102.6100 ‹ previous : +856-21-(610000...619999) next › : +856-21-(710000...719999) Dialling Instructions For trunk calls: 0 21 630000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 00 856 21 630000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 630000 ~ 639999 (Count: 10,000) Example: +856-21-630000 / 00856-21-630000 (021-630000 / 0-21-630000) +856-21-630001 / 00856-21-630001 (021-630001 / 0-21-630001) +856-21-630002 / 00856-21-630002 (021-630002 / 0-21-630002) +856-21-630003 / 00856-21-630003 (021-630003 / 0-21-630003) +856-21-630004 / 00856-21-630004 (021-630004 / 0-21-630004) ...+856-21-xxxxxx / 00856-21-xxxxxx (021-xxxxxx / 0-21-xxxxxx) ...+856-21-639995 / 00856-21-639995 (021-639995 / 0-21-639995) +856-21-639996 / 00856-21-639996 (021-639996 / 0-21-639996) +856-21-639997 / 00856-21-639997 (021-639997 / 0-21-639997) +856-21-639998 / 00856-21-639998 (021-639998 / 0-21-639998) +856-21-639999 / 00856-21-639999 (021-639999 / 0-21-639999)