Warranty Non Existant
In the store you got it at, in the very minute you purchased the product, you didnt notice that the phone was defective? Upon activating it, you need to enter an activation code, you need to open the phone, were you really that dumb not to notice?
It doesnt matter what carrier customer abuse will NEVER be covered by manufacturer warrantee.
Go play frisbee with an iphone and then ask ATT to help you out.
ANd it is true, if you tell customer service you are going to cancel they will credit you on your bill so many ways just to keep you because they have been signing up so many non paying customers that they are dying slowly.