Straight talk still able to use at&t iphones?

I was just wondering if straight talk still provides at&t sim cards for there bring your own phone program, I've searched and can't find any on there site. The phone is not unlocked and I was just wondering if it was still possible?

Added (1). The phone is not unlocked, and I was hoping I wouldn't have to get it unlocked…

Yes, you can use any unlocked phone since Straight Talk is a GSM network.

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