Do Japanese phones work outside of Japan?
Many phones that are sold in Japan can operate on 3G and GSM networks (only in certain countries) with the appropriate international roaming plans, although while overseas some of their advanced functions will likely not work. This means that a person with a handset and service provided by a Japanese mobile phone carrier can roam when travelling outside of Japan.
Generally speaking it is not possible to use a Japanese phone with a foreign service provider due to network differences and because the handsets are locked. Japanese carriers do not unlock handsets. Also, Japanese phones are designed at a hardware and software level to work with only a particular network. As a result they are not interchangeable even between Japanese service providers and some of their features are disabled when used off of the network they were intended for.

Source:http://www.japan-guide.com/e/e2223.html
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