AT&T sent me an iphone that was cancelled how to use it?

(Can I get the answer I wanna hear not no "do the right thing crap") At&t sent me an iphone 5s after they had already canceled the order and they didn't charge me so can they track it if I use it for music while the (not activated SIM card) it came with is in it because the SIM card has to be in it for me to start using it on iTunes

They'll bill you within 30 days if you don't return it. They sent it to you and know you have it. So your options are to return it, to pay the bill when it arrives, or to ignore the bill and go intro collections.

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