Okay, I'm going to be in Japan later this year for quite some time and would like to be able to use my iPhone 3G without paying an arm an a leg for AT&T's international rates. I actually think I'd be using the data more than voice calls, so I could get one of the International data plans that AT&T has, but they are still expensive (and I'd have to guess how much data I may use to pick the right plan). Now, if I unlock with yellowsnow (I'm still at 2.2), I should be able to use a Softbank sim, right? Has anyone actually tried this and verify that it will work? Particularly, I want to make sure data will work.