Originally Posted by bocastephen

Japan has always had different rules about locked phones, not the same as the USA. I think only recently were phones even allowed to be unlocked in Japan.

Originally Posted by www.apple.com/JP & Translated by Google

Can you use the iPhone even in a foreign country?

Yes. iPhone is available in the carrier network of the GSM system in the world. Since the iPhone sold in apple.com has been released SIM lock, you can use if you buy a SIM card and service from a travel destination of communication operators. Or, there is also a way to use the international roaming by your current carrier. Please contact your wireless service provider for international roaming charges.