Can you use your iPhone as Prepaid?

I have recently acquired an iPhone 4 with a clean ESN and want to give it talk, text, and data capabilities without an annual contract or monthly fees. I have heard of the GoPhone program by AT&T and was wondering how to use it. I would be grateful for any information regarding this or any similar program.

You can pretty much use any phone as prepaid. But the older versions prepaid plans are better

Iphone… Only three companies provide service for Iphone… AT&T, Verizon, and Cricket… AT&T and Verizon… You gotta have plans and gotta have contracts… However, if you go for Cricket, it is prepaid, NO CONTRACT or monthly hidden fees or whatever… But you gotta paid monthly to use the services… If you don't pay, they will cut off your services

Your phone has to be unlocked.

You say iPhone 4 with clean ESN, that means the phone is CDMA. It is not compatible with AT&T.