How to dial a phone number in Osaka Japan?
From outside Japan, a caller would dial their international call prefix (typically 00 in Europe and 011 in North America), followed by 81 (the country code for
Japan), then 66 the 2-3 digit area code of the place you're calling (Osaka) minus the trunk code '0', and finally the local number minus the trunk code '0'. All local telephone numbers dialled within Japan must use the leading '0' and the area phone code, even when calling locally.