Okay so basically I have an iPhone 4 preordered from AT&T and I travel to Switzerland and the UK alot and I will be in the UK on the 2nd of July and again on the 27th of July. My problem is that I would like the iPhone unlocked. Do you guys think I could sell my preordered iPhone 4 16 GB from AT&T on ebay for 750-850 and then when I arrive in UK just pick one up at the apple store unlocked ? So when I go to UK I could use my O2 simcard and in US my AT&T simcard. What do you guys think ?