Hey, my brother is in the marines and is going to be spending a good majority of the next 2 years in Japan. I have been trying to do research on the mobile networks in Japan, but it has been confusing. What we are looking for is a phone that he can order right now, have delivered in the USA, use on a network(likely GSM?) and then when he goes to Japan he can use on a Japanese network.

My initial thought was to get the Samsung Galaxy Nexus directly from Google. No contracts, decent price, etc. But I am unsure whether or not it will run on any Japanese networks. If it does, which one will it run on? Any input would be greatly appreciated.