Can I use the AT&T Pay As You Go plan on an iPhone 4 or 4s?

I know the iPhone uses micro SIM cards and Pay As You Go has those now. I heard it's possible, you just won't have any data outside of Wi-Fi. I don't need the data part of the plan anyways, I just want the texting and calling because I always have Wi-Fi wherever I'm (work and home).

Added (1). This site doesn't say anything about texting with pay as you go. Will texting still work too? Http://osxdaily.com/2011/03/06/iphone-4-pay-go/

I think you have to jailbreak it

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