IPhone 5, 2 year contract or full retail?

I want to buy a iPhone 5 with AT&T but I'm not sure what a two year contract is. Since I have a family plan with my aunt and have a iPhone 4 but want to go buy a iPhone 5 with the two year contract. But the problem is will I be able to do that with no problem?

The full retail price is so expensive. Just get the 2 Year contract.

  • What is Per Month Two Year and Full Price? I'm saving up for an iPhone 6 so can someone tell me what the two year contract and the full price mean? I already know what a per month is (obviously)
  • My iPhone power button is stuck and I have a full year warranty? Ok, so my iPhones power button has been stuck for awhile now and need to get a new one I still have my warranty but can't find the paper with all my contract stuff the day I got my iPhone can he look at like a serial number or something on my phone that shows I still have my warranty?
  • I have a big problem, i cracked my iphone screen and my home button and didn't fix it until a year later, i didn't fix my iphone for a year,? By this time, i have forgotten my password to unlock my phone, which led to my iphone disabled and linkin it to itunes. Finally remembere my password on itunes connected the usb. And itunes said, do you want to allow access info on iphone? Click continue. Then says please respond to iphone.Tho nothin cause its locked. I don't know what to do, because the photos on my iphone are precious to me and if i could get it factory reset id lose them all. Even tried icloud. With no sucess.
  • How to upgrade without paying full retail? I have a contract with AT&T and I had an iPhone 5 that was stolen a couple of months ago. I'm only about 11 months into my contract so I'm still paying for it. I want to upgrade to the new iPhone coming out later this month. Can I just pay my ETF and then buy the iPhone on a new contract? There are two other lines on my plan that I would not cancel. And would I be able to get my same number back?