I am an iPhone 4 user but like to stay up to date with the iPhone as many of the new features are useful to me and I have the money to do so, so why not upgrade. One thing I am not sure of is the 2 year contract with AT&T. Can I still stay on the contract and move the service from my iPhone 4 to the iPhone 5, making the iPhone 4 have no service? I would like to know how everyone does it that upgrades to every new iPhone generation. Thanks.