How to turn an iphone 4 into straighttalk plan?

Seriously i need help!
I don't know how to do this so i need someone to help me, like does it matter if it has a contract or
what? I know it needs to be at&t, but like what's a gsm?! Can someone just help and tell me everything i needa do?

The GSM is the network that the phone company is using. So for example, AT&T and T-Movile, including Straight Talk uses GSM.
Verizon, Sprint and Cricket uses CDMA.
So you CAN change your plan to Straight Talk if you have AT&T. But you do need to finish the 2-year contract that is given (unlocked). Or at least that i know of. I heard that it doesn't need to be unlocked but i think thats false. Anyways you might want to talk to your phone company to make sure.
First, go to walmart, buy a Straight talk SIM card (unlimited costs 49 bucks with tax). Scratch off the silver area and you'll find a PIN code, call the number that shows in the card and give that PIN number to the answering machine. You're done!

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