Hello! It is my understanding you want to sell your iPhone6s Plus. I can help you with this.
The best way is for you is to already have the phone unlocked before you sell it to your friend. I can send you the link for the Device Unlock Request. It is very simple to fill out and you submit it online. You will get an email from us which needs to be acknowledged and then you will receive another email with an approval or a denial.
If you have any more questions, please reach out to us on the Community Forums. Have a great weekend!
Donna V, AT&T Community Specialist
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