I have an Iphone 3g w/ att that is jailbroken and updated to 3.0... I am considering purchasing a new iphone simply because my daughter wants one but doesn't need the data plan and is content to keep her phone and use my old one 'unactivated' as an ipod touch. Can I do this; how? Before purchasing new one, if I backup my old one then buy new... Then use an old att sim card in old phone, in airplane mode. restoring if need be. What do you think? Don't want to do if won't work, upgrading isn't worth it if th old one is just a brick.