Area Code +880-31-(810000...819999) located in Chittagong, Chittagong (10), more detail is as below. Place International Dialing Code : 880 International Prefix : 00 National Prefix : 0 National Destination Code : 31 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 : BTTB Click here to buy Bangladesh Area Code Database Other Information Language Code : bn (Bengali) Country Number : 50 (Bangladesh) Country Code : BD (Bangladesh) Region Code : 10 Region Name : Chittagong City : Chittagong Timezone : Asia/Dhaka Coordinated Universal Time : +06:00 Daylight Saving Time : No National Significant Number Minimum Length : 8 Latitude : 22.3700 Longitude : 91.8000 ‹ previous : +880-31-(740000...759999) next › : +880-321-(51000...53999) Dialling Instructions For trunk calls: 0 31 810000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 00 880 31 810000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 810000 ~ 819999 (Count: 10,000) Example: +880-31-810000 / 00880-31-810000 (031-810000 / 0-31-810000) +880-31-810001 / 00880-31-810001 (031-810001 / 0-31-810001) +880-31-810002 / 00880-31-810002 (031-810002 / 0-31-810002) +880-31-810003 / 00880-31-810003 (031-810003 / 0-31-810003) +880-31-810004 / 00880-31-810004 (031-810004 / 0-31-810004) ...+880-31-xxxxxx / 00880-31-xxxxxx (031-xxxxxx / 0-31-xxxxxx) ...+880-31-819995 / 00880-31-819995 (031-819995 / 0-31-819995) +880-31-819996 / 00880-31-819996 (031-819996 / 0-31-819996) +880-31-819997 / 00880-31-819997 (031-819997 / 0-31-819997) +880-31-819998 / 00880-31-819998 (031-819998 / 0-31-819998) +880-31-819999 / 00880-31-819999 (031-819999 / 0-31-819999)