Can I use AT&T iPhone 5 on Straight Talk?

I purchased an AT&T iPhone 5 off a friend who wanted to switch back to Android. I do not believe the phone is unlocked, but it could be. How would I check to see if it is or isn't? If it is not do i need to unlock it, if so how do I do that? Does Straight Talk have nano sim cards for purchase? Or would I have to cut the sim down to make it work? What is the best way to go about it? Does anyone have experience with this situation? I have an iPhone already and I don't want to pay 600+ dollars just to buy Straight Talks version at Walmart just so I can pay $45 a month.

Hi Mateo - I'm actually not 100% sure about how you can find out if your friend's AT&T iPhone is unlocked. Though, I did find a discussion about it in the Apple community that is pretty helpful.
( https://discussions.apple.com/...0&tstart=0 )

I'm familiar with Straight Talk though, and they currently do not allow users to bring iPhone 5's to their network outside of the Wal-mart deal. They don't sell nano SIMs, only micro SIMs.

I know you already purchased the 5, but if you were willing to have a 4 or 4S you wouldn't have a problem getting on the Straight Talk network.

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