Subject: USA t-mobile phone use in Japan
Hi Georgia,

Sorry, bad news. T-Mobile uses GSM and you can't roam in Japan with it. It sounds strange, but Japan's cellular networks are pretty much incompatible with the rest of the world. They might be able to arrange for you to rent a phone in Japan, however, on Vodafone's J-Phone which is a T-Mobile roaming partner, that you can put your sim card into.

Doug Birmingham, England