Area Code +856-21-(710000...719999) 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 : 710000 Subscriber Number To : 719999 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-(630000...639999) next › : +856-21-(730000...739999) Dialling Instructions For trunk calls: 0 21 710000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 00 856 21 710000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 710000 ~ 719999 (Count: 10,000) Example: +856-21-710000 / 00856-21-710000 (021-710000 / 0-21-710000) +856-21-710001 / 00856-21-710001 (021-710001 / 0-21-710001) +856-21-710002 / 00856-21-710002 (021-710002 / 0-21-710002) +856-21-710003 / 00856-21-710003 (021-710003 / 0-21-710003) +856-21-710004 / 00856-21-710004 (021-710004 / 0-21-710004) ...+856-21-xxxxxx / 00856-21-xxxxxx (021-xxxxxx / 0-21-xxxxxx) ...+856-21-719995 / 00856-21-719995 (021-719995 / 0-21-719995) +856-21-719996 / 00856-21-719996 (021-719996 / 0-21-719996) +856-21-719997 / 00856-21-719997 (021-719997 / 0-21-719997) +856-21-719998 / 00856-21-719998 (021-719998 / 0-21-719998) +856-21-719999 / 00856-21-719999 (021-719999 / 0-21-719999)