Can I put a GoPhone sim card in an unlocked iphone 4/4s?

So I have a gophone simcard and I'm getting an unlocked iphone soon from craigslist. Will I need to cut the simcard to fit? And how will I go about getting the sim card activated? I know they will ask for an IMEI number and I know they won't activate it if I give them the iphone IMEI. So what IMEI should I give them? Can I use the one from my sister: s gophone even if it is in use? And how can I get the 3G to work? 10 points best answer, thanks!

I usually buy a cheap 15$ gophone for the sim since a sim is 15$ more and follow the instructions on the gophone box thing on the iPhone and you could activate one freely without registration. But I'm not familiar with the method. Just do what the gophone says via iPhone.

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