Hello everyone i am new to this forum. I have been looking for an answer to my question the past few days and have not been able to find a solid answer. So let me try it in a forum. Will my 8gb jailbroken/unlocked iphone running 3.1.2 firmware work in Japan using a prepaid sim? I do not want to use my at&t sim while i am over there. I will be in Japan Feb 10th for about 3 weeks (Okinawa for a week then main land Japan). I heard i can get a sim from Softbank but i will have a data issue. I will have access to the PX if i need to get on base also. Basically i want to be able to access data more than calling. I want to be able to run text apps such as Ping, Free Foto Messenger, etc... Please help.