Ok, So my dad has an iPhone that he got as a gift sorta (it was used) and so he let me jailbreak it for fun. Now I want to know if he can unlock it to use with the AT&T sim from his Nokia flip phone. He is on 3.1.2 and he does not have a data plan or anything. So can he use his SIM with his iPhone if it is unlocked. If not I wont bother unlocking it. By the way it the old iPhone running EDGE.