On AT&T, how much does it cost to buy an upgrade, and how much does it cost to terminate a contract?
There is a upfront termination fee on the spot if you terminate which is &340 plus or something and for example you used the service for 12 months where the contract is for 24 months then you would have to pay $10 for each month pending on contract
Go to AT&T ask them. It will depend on how long you have been with them and if you are a heavy hitter (use a lot of mins). Why are you leaving.