How to get straight talk with my att iphone4?

I have an IPhone 4 that is an AT&T phone and I want to get straight talk! The $45 plan! What is the process I have to do. Do I have to get it unlocked? Do they have a SIM card for my phone?

Jailbreak it. Download Sn0wbreeze from Cydia.

Talk to AT&T and ask to unlock your iPhone. You will have to pay a fee though which costs a lot of money, but if your desperate, I would pay that amount. After your iPhone is fully unlocked, go to straighttalk.com and they will take you from there.

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