Hi: I am going to Tokyo for one week and would like to use the iPhone there for local calls and internet. I was wondering if anyone familiar with Japan can tell me if I can get a prepaid SIM card there and if I will be able to get data and voice working. I tried searching the internet but get all kinds of contradictory info. If so, where is the best place to get a SIM card--and which carriers offer? BTW, the phone 3.0 FW and is unlocked with ultrasn0w.