Area Code +81-503-(3630000...3639999) 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 : 3630000 Subscriber Number To : 3639999 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-(3620000...3629999) next › : +81-503-(3640000...3649999) Dialling Instructions For trunk calls: 0 503 3630000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 010 81 503 3630000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 3630000 ~ 3639999 (Count: 10,000) Example: +81-503-3630000 / 01081-503-3630000 (0503-3630000 / 0-503-3630000) +81-503-3630001 / 01081-503-3630001 (0503-3630001 / 0-503-3630001) +81-503-3630002 / 01081-503-3630002 (0503-3630002 / 0-503-3630002) +81-503-3630003 / 01081-503-3630003 (0503-3630003 / 0-503-3630003) +81-503-3630004 / 01081-503-3630004 (0503-3630004 / 0-503-3630004) ...+81-503-xxxxxxx / 01081-503-xxxxxxx (0503-xxxxxxx / 0-503-xxxxxxx) ...+81-503-3639995 / 01081-503-3639995 (0503-3639995 / 0-503-3639995) +81-503-3639996 / 01081-503-3639996 (0503-3639996 / 0-503-3639996) +81-503-3639997 / 01081-503-3639997 (0503-3639997 / 0-503-3639997) +81-503-3639998 / 01081-503-3639998 (0503-3639998 / 0-503-3639998) +81-503-3639999 / 01081-503-3639999 (0503-3639999 / 0-503-3639999)