How to use my att gs3 on straight talk?

I was using an att iphone 4 on straight talk but wanted to change to an att samsung gs3. Can you help me get straight talk to work on an att samsung gs3?

Since they are both AT&T, it should be as simple as moving your sim to the new phone. If they are not the same size, you may need to buy a new sim from Straighttalk, but I think they are both micro-sims.

Other than that, you may need to manually set the APN settings on the new phone to be able to send and receive picture messages. You can find the settings here: http://www.straighttalkbyop.com/program.php Enter them exactly as shown, they are case sensitive.

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