Hiya, thanks for coming back again to mygola. I love the fact that you are using us so much 
I had to go through a lot of forums to figure out how it could work best for you. One of the main things is AT&T is the exclusive carrier for the iPhone in the United States. Luckily they do offer a variety of prepaid options but is important that you do choose the right one or get stuck with horrible roaming charges!
This link from Answerbag explains the prepaid options available for the IPhone which includes Pay As You Go, data plans and the like.
I also found you another link which details costs for the various plans and how to activate prepaid on your IPhone.
The other piece of advice is unlock your network. If you wish to try this out, check this link here on how to use T-Mobile (who is the other big provider) on your phone in the US.
Other options:
Do read here for Mike's experiences of using his iPhone in the US. Note: This is with particular reference to Australia but am presuming you can use this as well.
I think I would RECOMMEND you buying a prepaid phone in the US itself. I reckon this will be a far cheaper and viable option in terms of the features that will get provided to you. If you want help in deciding which provider will work best for you, let me know and I will suggest more options based on what kind of plan you would want.
Cheers
Kirti
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Thank you so much again Kirti! :)Your efforts really made my day! It'll help me a lot!
Apr 14, 2010