I'm going to be studying in England for the upcoming academic year and I recently just sold my 1G iPhone (GoPhone). I've been debating getting a 3G iPhone in the UK or US and then using it in the UK but I was wondering what would be the feasibility in transferring a US (AT&T) to UK (O2) or vise versa? The iPhone was really great in me keeping track of all my schedules and communications, and the current phone I'm using (cheap-o pay as you go) would obviously falter in that. I just don't want to get a phone that I would have to unlock and possibly brick in my travels. Thanks!