Area Code +81-257-(160000...169999) located in Minamiuonuma (Muikamachi), Niigata (15), more detail is as below. Place International Dialing Code : 81 International Prefix : 010 National Prefix : 0 National Destination Code : 257 Subscriber Number From : 160000 Subscriber Number To : 169999 National Destination Code Length : 3 Uses National Destination Code : Yes National Significant Number Length : 9 Number Type : G (Geographic Land Line, Fixed Line) Carrier Name : SoftBank Telecom Click here to buy Japan Area Code Database Other Information Language Code : ja (Japanese) Country Number : 392 (Japan) Country Code : JP (Japan) Region Code : 15 Region Name : Niigata City : Minamiuonuma (Muikamachi) Timezone : Asia/Tokyo Coordinated Universal Time : +09:00 Daylight Saving Time : No National Significant Number Minimum Length : 9 Latitude : 37.1600 Longitude : 138.9300 ‹ previous : +81-257-(130000...139999) next › : +81-257-(170000...179999) Dialling Instructions For trunk calls: 0 257 160000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 010 81 257 160000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 160000 ~ 169999 (Count: 10,000) Example: +81-257-160000 / 01081-257-160000 (0257-160000 / 0-257-160000) +81-257-160001 / 01081-257-160001 (0257-160001 / 0-257-160001) +81-257-160002 / 01081-257-160002 (0257-160002 / 0-257-160002) +81-257-160003 / 01081-257-160003 (0257-160003 / 0-257-160003) +81-257-160004 / 01081-257-160004 (0257-160004 / 0-257-160004) ...+81-257-xxxxxx / 01081-257-xxxxxx (0257-xxxxxx / 0-257-xxxxxx) ...+81-257-169995 / 01081-257-169995 (0257-169995 / 0-257-169995) +81-257-169996 / 01081-257-169996 (0257-169996 / 0-257-169996) +81-257-169997 / 01081-257-169997 (0257-169997 / 0-257-169997) +81-257-169998 / 01081-257-169998 (0257-169998 / 0-257-169998) +81-257-169999 / 01081-257-169999 (0257-169999 / 0-257-169999)