Hi all, My roommate bought an 8gb iPhone today, since he won't be needing the 8gb he will trade me for my 4gb. My question is, will the process be as easy and swapping the Sim cards? Will he still be able to activate through iTunes and create his own AT&T account? Will I have any problems in getting my sim card to work in the 8gb? I have a feeling no, but just want to make 100% sure. Thanks.