Area Code +81-501-(4380000...4389999) located in VoIP, more detail is as below. Place International Dialing Code : 81 International Prefix : 010 National Prefix : 0 National Destination Code : 501 Subscriber Number From : 4380000 Subscriber Number To : 4389999 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 : Softbank Broadband 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 : +81-501-(4370000...4379999) next › : +81-501-(4390000...4399999) Dialling Instructions For trunk calls: 0 501 4380000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 010 81 501 4380000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 4380000 ~ 4389999 (Count: 10,000) Example: +81-501-4380000 / 01081-501-4380000 (0501-4380000 / 0-501-4380000) +81-501-4380001 / 01081-501-4380001 (0501-4380001 / 0-501-4380001) +81-501-4380002 / 01081-501-4380002 (0501-4380002 / 0-501-4380002) +81-501-4380003 / 01081-501-4380003 (0501-4380003 / 0-501-4380003) +81-501-4380004 / 01081-501-4380004 (0501-4380004 / 0-501-4380004) ...+81-501-xxxxxxx / 01081-501-xxxxxxx (0501-xxxxxxx / 0-501-xxxxxxx) ...+81-501-4389995 / 01081-501-4389995 (0501-4389995 / 0-501-4389995) +81-501-4389996 / 01081-501-4389996 (0501-4389996 / 0-501-4389996) +81-501-4389997 / 01081-501-4389997 (0501-4389997 / 0-501-4389997) +81-501-4389998 / 01081-501-4389998 (0501-4389998 / 0-501-4389998) +81-501-4389999 / 01081-501-4389999 (0501-4389999 / 0-501-4389999)