How can I connect a used iphone to AT&T? ?
I bought a used iPhone and noticed that they're completely sealed (that is...there's no access to the battery or SIM so Im wondering if anyone knows . I currently have service with AT&T I have a blackjack and would like to use the iPhone with my service. Can j just walk in to any AT&T store and have the iPhone activated? If so can I just call AT&T and have them activate my phone?

It kinda depends if you have the original iPhone or 3G. You should be able to do that in the store or you can activate it through iTunes too.
I think you’d better go to AT&T stores to ask them.