I have a 2 year contract with AT and T, ending next year.
I already had an iPhone and my friend gave me his new iPhone to activate it for him. So I turned it on, it needed me to pop in my SIM card and so I did.
It apparently "activated the phone". Is this going to show up on my bill or anything? Does it even cost anything?
you only have the activation fee associated with buying a discounted phone. In your case, you should not have any fees but you do need them to make sure your account has the right data plan so that features such as visual voice mail and such work properly. When you are ready to swap phones, you may need a new SIM (You need a micro-sim) and a call to ATT will get you up and running
For service or support questions including existing order status, call: Customer Support: 1-800-331-0500
Information on iPhone unlocking can be found here by copying this link into your browser: https://www.att.com/deviceunlock/client/en_US/