You used to have to be an Att customer or a previous customer but not now. I have a couple iphones I am selling and I went to check out the unlock request page and they have changed it and allow anyone to request an unlock on any Att phone. Go here if you have a phone you want to have unlocked, it said for me to allow 2 business days for the request
https://www.att.com/deviceunlock/#/
https://www.att.com/deviceunlock/#/
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