Hi all, perhaps we have attempted this before. However, I have a locked AT&T iphone4 from the US and am currently in the UK. I was thinking i could take the locked ip4 to an apple store in London, complain of the battery and try and swap it out under warranty, and perhaps they would give me a brand new unlocked ip4 (since thats what they sell there)... Anyone have any luck with this?? Thanks!