i have an att prepaid phone though iwant to buy a brand new iphone 3g as well as was wondering can i put a sim label from my go phone in to a iphone?

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• can I buy a prepaid ATT SIM for an Iphone 3
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• using same sim card from contract for prepay At&t iphone
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Related solution post:

1. Can I buy a contract phone, and use a prepaid SiM on att?
2. Can i buy an iphone and put my go phone sim card in it?
3. can you buy a prepaid phone, and put your working sim card in it?
4. att go phone sim locked to phone, i want it in my iphone 3g?
5. If I buy AT&T SIM card from ebay, how do I activate it for ATT GOPHONE?