How to make my iphone prepaid?

I'm thinking about buying a refurbished iphone 4s on gamestop.com, and I have a few questions. First, the one I'm looking at said's that it is for AT&T, which is good because that is the carrier I use. Before I buy it, how can I tell if it is unlocked. I don't want to purchase a contract by calling AT&T. If it is locked, how do I unlock it? I know that I can cut my sim card to the micro sim card size, but will that work, will I keep my number? If someone understands and has the answers please tell me!

Apparently, you need a GoPhone sim card, and just to replace the one in the side of your iPhone. Seems too easy to be true. Pretty cool, looking into this for myself.

You pay after your AT&T iPhone get unlocked! Only 10$ For the opening!

Contact here to know, if it's Lock or Unlock!
https://www.facebook.com/...5392969591

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