How to turn a IPhone into a GoPhone?

I've looked it up but i keep finding different solutions to this.
I have a gophone that i've been using for a year and a half, it has a orange SIM card and i have another orange SIM card that hasn't been activated. Is there any version of the iphone that uses the orange SIM card? If not how do i switch my current SIM card into a blue one? I've read it needs to be blue for some of them, is this right? And will it even work? And i don't really want a jail broke one.
Any help is appreciated because at&t is just too expensive for me to pay monthly. And i have to use at&t because its the only one that gets good service in my area

i've asked this in one place but haven't got a answer yet so i'm trying again

You'll need to unlock it and iPhone 4 and 4s takes micro sim not sim

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