I have tested this with a iPhone 3G and 3GS, it should work with an iPhone 4 but I do not have theAT&T version to test, this will not work with a Verizon iPhone.
Very simple and affordable way to use your iPhone off contract. you do not need to jail break your iPhone or unlock it.
here is what you need and the steps
iPhone 3G or 3GS (Maybe iPhone 4, not 4s)
AT&T GoPhone SIM card (I got mine from Amazon for $3)
Active the SIM card by going online or customer service, they will ask you for the SIM card ID and the EMI number, I had an older AT&T phone so I gave them that or you can just tell them you do not have one yet. Do not give them the iPhone EMI number.
Place SIM card in iPhone and it will search the network and you should be ready to go, you will need to fund your GoPhone account from your credit card and then you will be able to go online and by services.
In most cases the data plan will work but you will need to create a custom APN setting for it, just go to http://www.unlockit.co.nz/unlockit/ on your iPhone (make sure you are connected to the internet through WiFi) and select the Cingular APN for iPhone. once you have done that turn off WiFi and test the data.
Thats it, no jail breaking or unlocking, My GoPhone account is setup with 10cents per minute and 10MB of data, I don't use this as my primary phone much and just wanted an iPhone for some data.
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