I'm on a family plan with ATT. I got the 4S shortly after it came out, (around November.) and when I call *639#, it sends me the standard: I'm somewhat confused as to what this means, can someone just simply lay it out for me of what it would cost (if even possible) to upgrade before I qualify? I'm assuming it's a huge amount of cash but I'm just wondering. I know one option is to use another family member's upgrade but I don't know if I will be able to do that. Thanks in advance.