Can I Use a Prepaid AT&T Sim Card in an iPhone 4?

I have an iPhone 4 (AT&T) if I buy a prepaid plan, and use a SIM card cutter to get the prepaid SIM card to fit into the slot, can I used my unlimited data/talk/text plan in my iPhone 4?
An attendant online told me the iPhone software is not compatible with prepaid data plans, so only the texting/calling would work, but I feel like she was just trying to get me to buy a post-paid plan.

The attendant was correct in telling you that only the texting and calling will work on the iPhone 4 if you have it on the pre-paid plan. Same thing happens with Windows phones and BlackBerry.

She is right about the talk and text only being unlimited. On their prepaid.data is extra and not unlimited. I don't know about it not being compatable with the prepaid data.

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