I bought a discounted iPad 4 from AT&T last year. Signed a 2 year contract so I received $100. off. That brought the price of my 32GB version down to $629. I called AT&T tonight to see what the scoop is if I want to sell it and get the new iPad Air. The person I spoke to said that the iPad is locked and wouldn't be able to be used on another network outside of AT&T unless I pay a $106. fee. Don't know where the additional $6. came from and I thought it would be prorated so I figured I'd only pay $50. because I've had it for a year. I won't have to pay this fee if I sell it to someone that will be using it on the AT&T network. Just passing along the info incase anyone else went with this promotion and is thinking about selling.