Can I put a metropcs sim card into an at&t unlocked iPhone?

Can I put a metropcs sim card into an at&t unlocked iPhone?

Added (1). I want to buy an iPhone from this guy on craigslist but I want to make sure it's unlocked so I want to know if I can put my phone's sim card in his iphone.

Yes. You may not get all features of the phone to work, but basic calling/texting should work.

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