I'm buying a first-gen iPhone from one of my friend's boyfriend, it's a 8gb model. Hes letting me try it out for a couple weeks, to make sure I like it and its not broken.

Is there anything I should look for in seeing if its broken in any way?

And, all i have to do is jailbreak it, and then re-activate it, to get it working with my existing at&t SIM card, correct?

Thanks for any help!