Can I put my iphone on straight talk?

I got a phone and my mom stopped paying for the phone, can I take the sim card out and put it on straight talk( its an att phone )

Most likely not, as if your mother stopped paying on the contract, AT&T put a bad mark on the phone's serial number, which renders it useless with other carriers, and it is illegal to circumvent a bad ESN block in the US.

However, if the contract was paid off, and the phone has a clean ESN, you can use it with Straight Talk's BYOD SIM card program if you wish.

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