Go phone prepaid mini sim card for iPhone 4?

Hi, i just got a iPhone 4 and its the AT&T version. I saw on YouTube that to use the prepaid go phone service all you have to do it buy a mini sim card pop it in and add money and all that stuff. I was wondering if I buy one of those sim cards off Amazon will it work automatically if I just add money or does it have to be somehow activated.

You have to buy an unused one and activate it for gophone online or over the phone then you can use it. Also in the methods i've seen data doesn't work but if you activate it like one of their android gophones, then it might work, but it will cost more a month to add a data package.

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