Iphone SIM Card Swap - Possible?

So AT&T has Iphones on sale if you are a new customer, or if your eligible for a phone upgrade - I have a family plan, and one of the lines (my brothers) is eligible for the upgrade. Unfortunately it isn't the line I would like to use the Iphone with.

If I order the phone (saying it was for the line that is eligible) would I be able to put my SIM card in it? I know with most phones this wouldn't be a problem at all, but I'm not sure if they do something different with Iphones that makes them only work with certain numbers.

Thanks for any help guys.

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dont they carry serial id's?

I dont think so... but im not sure...