I am an att gophone customer who bought an iphone 4s from a friend. I use to use an iphone 3g but it broke so i am back to a generic phone. The friend gave me the microsim that came with the iphone, my question is how do I activate the microsim with my phone plan and info. Im not worried about contacts or anything just the activation. If i go to the att store to have them transfer it will they make me sign up for a contract?