Area Code +856-21-(810000...819999) 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 : 810000 Subscriber Number To : 819999 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-(730000...739999) next › : +856-21-(830000...839999) Dialling Instructions For trunk calls: 0 21 810000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 00 856 21 810000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 810000 ~ 819999 (Count: 10,000) Example: +856-21-810000 / 00856-21-810000 (021-810000 / 0-21-810000) +856-21-810001 / 00856-21-810001 (021-810001 / 0-21-810001) +856-21-810002 / 00856-21-810002 (021-810002 / 0-21-810002) +856-21-810003 / 00856-21-810003 (021-810003 / 0-21-810003) +856-21-810004 / 00856-21-810004 (021-810004 / 0-21-810004) ...+856-21-xxxxxx / 00856-21-xxxxxx (021-xxxxxx / 0-21-xxxxxx) ...+856-21-819995 / 00856-21-819995 (021-819995 / 0-21-819995) +856-21-819996 / 00856-21-819996 (021-819996 / 0-21-819996) +856-21-819997 / 00856-21-819997 (021-819997 / 0-21-819997) +856-21-819998 / 00856-21-819998 (021-819998 / 0-21-819998) +856-21-819999 / 00856-21-819999 (021-819999 / 0-21-819999)