Help... Im going to Israel on monday for 4 months and I would like to use my iphone I called At&t about it and the plans are ridiculous, not to mention I use way more data then the highest plan. So I want to unlock it, is there any way to unlock an iphone 3g on 2.0.2 and if so does it really void my warranty..? I mean can they really tell that it was unlocked if I restore it when I return?