At&t iphone 4s to straight talk?

I'm getting an iphone 4s from AT&T tmr. And am gonna make it run off straight talk. So what do i need to do beside put the sim card chip in. I'm hearing stuff abt unlocking and jailbraking the phone and don't know if ill have to do it. Will i

Never jailbreak(it voids the warranty and you can never again get help from apple. Unlocking is where if you are still in a contract you must pay the fee to get out of the contract aka unlock. If you are out of a contract you are good to go. Though at&t may keep to phone locked even after you are out of contract

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