Area Code +81-503-(3420000...3429999) located in VoIP, more detail is as below. Place International Dialing Code : 81 International Prefix : 010 National Prefix : 0 National Destination Code : 503 Subscriber Number From : 3420000 Subscriber Number To : 3429999 National Destination Code Length : 3 Uses National Destination Code : Yes National Significant Number Length : 10 Number Type : V (VoIP, Location Independent fixed land line) Carrier Name : NTT Communications Click here to buy Japan Area Code Database Other Information Language Code : ja (Japanese) Country Number : 392 (Japan) Country Code : JP (Japan) City : VoIP Timezone : Asia/Tokyo Coordinated Universal Time : +09:00 Daylight Saving Time : No National Significant Number Minimum Length : 10 Latitude : None Longitude : None ‹ previous : +81-503-(3410000...3419999) next › : +81-503-(3430000...3439999) Dialling Instructions For trunk calls: 0 503 3420000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 010 81 503 3420000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 3420000 ~ 3429999 (Count: 10,000) Example: +81-503-3420000 / 01081-503-3420000 (0503-3420000 / 0-503-3420000) +81-503-3420001 / 01081-503-3420001 (0503-3420001 / 0-503-3420001) +81-503-3420002 / 01081-503-3420002 (0503-3420002 / 0-503-3420002) +81-503-3420003 / 01081-503-3420003 (0503-3420003 / 0-503-3420003) +81-503-3420004 / 01081-503-3420004 (0503-3420004 / 0-503-3420004) ...+81-503-xxxxxxx / 01081-503-xxxxxxx (0503-xxxxxxx / 0-503-xxxxxxx) ...+81-503-3429995 / 01081-503-3429995 (0503-3429995 / 0-503-3429995) +81-503-3429996 / 01081-503-3429996 (0503-3429996 / 0-503-3429996) +81-503-3429997 / 01081-503-3429997 (0503-3429997 / 0-503-3429997) +81-503-3429998 / 01081-503-3429998 (0503-3429998 / 0-503-3429998) +81-503-3429999 / 01081-503-3429999 (0503-3429999 / 0-503-3429999)