OK, I am from Europe and I am coming to study in US in three weeks. I already have a factory unlocked iPhone 3GS but I wanna know some stuff. I looked through the internet and I haven't been able to find what I need. How many iPhones can I buy at AT&T? I would be the individual, not family package, because I will have only 1 number, but I would like to buy an extra iPhone for my brother (in Europe) as a gift for 199$ and not 599$ and that's why I wanna know how many iPhones can I buy? I also want to know, when I buy iPhone 5 with a plan, and then next year iPhone 6 comes along, and I will be making the upgrade, what happens with my year old iPhone 5? Do I keep it but must "unlock it through jailbreak" to use it, or do I have to return it to AT&T? Any answer will be appreciated. Thank you.