How to make an iphone 4s prepaid?

I bought an iphone 4s from my cousin the phone is from AT&T but i want it to be prepaid how do i do that? Do i just put a sim card in it? (The phone is not unlocked)
Need help.

No you have to take it to the store and get a contract for it. They don't work prepaid. Sorry.

You will need to get the phone unlocked. Once the phone is unlocked you can use Net10 or Straight Talk prepaid for $50 with Net10 and $45 with Straight Talk.

Get the phone unlocked, then pick up an H20 Wireless SIM at bestbuy. Their a prepaid company that uses AT&T's network.

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