Changing from normal sim card to iPhone 4 sim card?

I'm an AT&T customer with a smart phone. I'm wanting to buy an iPhone 4 but I know they take smaller sim cards than normal phones. If I buy an iPhone from an individual, can I take it to AT&T and have them give me a smaller sim card & transfer my information? Would I have to pay extra for it? Is it even possible?

You can cut any sim card to the right size and use it with an iphone. Most phone repair places will cut it for you for a small fee and sometimes free, or you can get a special sim card cutter/punch which is not expensive either.

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