Area Code +81-503-(3880000...3889999) 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 : 3880000 Subscriber Number To : 3889999 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-(3870000...3879999) next › : +81-503-(3890000...3899999) Dialling Instructions For trunk calls: 0 503 3880000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 010 81 503 3880000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 3880000 ~ 3889999 (Count: 10,000) Example: +81-503-3880000 / 01081-503-3880000 (0503-3880000 / 0-503-3880000) +81-503-3880001 / 01081-503-3880001 (0503-3880001 / 0-503-3880001) +81-503-3880002 / 01081-503-3880002 (0503-3880002 / 0-503-3880002) +81-503-3880003 / 01081-503-3880003 (0503-3880003 / 0-503-3880003) +81-503-3880004 / 01081-503-3880004 (0503-3880004 / 0-503-3880004) ...+81-503-xxxxxxx / 01081-503-xxxxxxx (0503-xxxxxxx / 0-503-xxxxxxx) ...+81-503-3889995 / 01081-503-3889995 (0503-3889995 / 0-503-3889995) +81-503-3889996 / 01081-503-3889996 (0503-3889996 / 0-503-3889996) +81-503-3889997 / 01081-503-3889997 (0503-3889997 / 0-503-3889997) +81-503-3889998 / 01081-503-3889998 (0503-3889998 / 0-503-3889998) +81-503-3889999 / 01081-503-3889999 (0503-3889999 / 0-503-3889999)