Area Code +81-503-(2030000...2039999) 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 : 2030000 Subscriber Number To : 2039999 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 : KDDI 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-(2020000...2029999) next › : +81-503-(2040000...2049999) Dialling Instructions For trunk calls: 0 503 2030000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 010 81 503 2030000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 2030000 ~ 2039999 (Count: 10,000) Example: +81-503-2030000 / 01081-503-2030000 (0503-2030000 / 0-503-2030000) +81-503-2030001 / 01081-503-2030001 (0503-2030001 / 0-503-2030001) +81-503-2030002 / 01081-503-2030002 (0503-2030002 / 0-503-2030002) +81-503-2030003 / 01081-503-2030003 (0503-2030003 / 0-503-2030003) +81-503-2030004 / 01081-503-2030004 (0503-2030004 / 0-503-2030004) ...+81-503-xxxxxxx / 01081-503-xxxxxxx (0503-xxxxxxx / 0-503-xxxxxxx) ...+81-503-2039995 / 01081-503-2039995 (0503-2039995 / 0-503-2039995) +81-503-2039996 / 01081-503-2039996 (0503-2039996 / 0-503-2039996) +81-503-2039997 / 01081-503-2039997 (0503-2039997 / 0-503-2039997) +81-503-2039998 / 01081-503-2039998 (0503-2039998 / 0-503-2039998) +81-503-2039999 / 01081-503-2039999 (0503-2039999 / 0-503-2039999)