Area Code +81-503-(3910000...3919999) 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 : 3910000 Subscriber Number To : 3919999 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-(3900000...3909999) next › : +81-503-(3920000...3929999) Dialling Instructions For trunk calls: 0 503 3910000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 010 81 503 3910000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 3910000 ~ 3919999 (Count: 10,000) Example: +81-503-3910000 / 01081-503-3910000 (0503-3910000 / 0-503-3910000) +81-503-3910001 / 01081-503-3910001 (0503-3910001 / 0-503-3910001) +81-503-3910002 / 01081-503-3910002 (0503-3910002 / 0-503-3910002) +81-503-3910003 / 01081-503-3910003 (0503-3910003 / 0-503-3910003) +81-503-3910004 / 01081-503-3910004 (0503-3910004 / 0-503-3910004) ...+81-503-xxxxxxx / 01081-503-xxxxxxx (0503-xxxxxxx / 0-503-xxxxxxx) ...+81-503-3919995 / 01081-503-3919995 (0503-3919995 / 0-503-3919995) +81-503-3919996 / 01081-503-3919996 (0503-3919996 / 0-503-3919996) +81-503-3919997 / 01081-503-3919997 (0503-3919997 / 0-503-3919997) +81-503-3919998 / 01081-503-3919998 (0503-3919998 / 0-503-3919998) +81-503-3919999 / 01081-503-3919999 (0503-3919999 / 0-503-3919999)