How to use gophone SIM card on iphone?

Ok so I put a gophone SIM card in my iphone. I was just wondering could i just buy an AT&T minute card on there or do I have to go on the AT&T site and get a plan which I really don't want to do. All I want is just the easy simple way which is to just get an AT&T minute card and just put the minute card on there.

You have to buy a plan for iPhone/any smartphone.

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