3GS not recognizing AT&T sim card

Hello all. I tried to search for this issue before posting but came up empty. I just inherited a 3GS from a friend when he upgraded. Whenever I try to activate it through iTunes, it tells me the sim card is not supported. As far as I can tell, I've done everything right so far. Got an iphone data plan through AT&T and have a new sim card (actually on the 3rd one since we kept thinking it was the sim card that was bad). I asked my friend, and he's confused cuz the phone worked for him when I gave it back for him to look at. The only difference between us is he's a PC and I'm a Mac, but that shouldn't change anything, should it? Or does the phone need to be reformatted in order to recognize my sim card?
::exasperated sigh:: Would love a working phone soon. ^_^

No,it's not possible.

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