I want to upgrade my iPhone 3G to a used iPhone 4, can I use the sim card already in the 4 or must purchase a new sim card?

I want to upgrade my iPhone 3G to a used iPhone 4, can I use the sim card already in the 4 or must purchase a new sim card?

You might want to ask you carrier that question.  I can tell you that when I gave my old iPhone 4 to my wife we were able to get my old sim card that was in the 4 reprogrammed with the wife's phone number.  The AT&T store didn't charge us to do this.

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