Hi, I live in the US and I wanted to buy an unlocked Iphone 4. As I understand it my options are to buy in Canada or Europe (so I could buy a device in the UK). I travel a lot which is why I need it unlocked but wanted to check if I got the device inthe UK for example I would have no problems using it back in the US on AT&T? Also if I go this route then the phone will always be unlocked and I want have problems with future updates? Thanks!!