The telephone country code for Japan is +81, and you must drop the trunk prefix 0 from the beginning of the Japanese domestic telephone number. If you are calling on a mobile phone, just enter the number in international format, beginning with the plus symbol; otherwise, replace the plus symbol with the international access prefix for outbound calls from the UK, which is 00.
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Universal International Freephone Numbers (UIFN) use telephone country code +800, followed by 8 more digits. If you are calling on a mobile phone, just enter the number in international format, beginning with the plus symbol. Otherwise, replace the plus symbol with your international access prefix.
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
The telephone country code for the United States (plus Canada and certain Caribbean-ish islands) is +1.
Calling on a mobile phone, just dial the number in international format, beginning with +1 (including the plus symbol); for example, +1 415 555 0123.
Calling from a landline phone, substitute the Japanese international access prefix 010 for the plus symbol.
Universal International Freephone Numbers (UIFN) use telephone country code +800. From a mobile phone in Japan, just dial +800 and the 8-digit subscriber number; from a landline phone in Japan, dial 010 800 and the 8-digit subscriber number.
To dial a Japanese toll-free 0800 number from outside Japan, dial it as if it were an ordinary Japanese geographic telephone number: replace the trunk prefix 0 of the Japanese domestic number with telephone country code +81. From a mobile phone, dial the number in international format, beginning with the plus symbol; the mobile network will automatically insert any needed prefix. From a landline phone, replace the plus symbol with the appropriate international access prefix for the location you are calling from. The most commonly used prefix is 00, but many countries use other prefixes.
If the call goes through, you will generally pay the normal international toll calling rate for a call to Japan. If the call does not go through, your best bet is to look on the web for an ordinary geographic number for the company you are trying to contact.
You need the Code of Japan and a calling card. Follow the instructions over the phone.