Unlocking Iphone that is not fully paid off yet (I'm not the original owner)
I bought a Iphone XS MAX a while ago on Facebook Marketplace, and that is carrier lock with AT&T, so far I didn't needed it to be unlock but now that I moved to France I would like to be able to use my phone.
When going on the unlock page of AT&T it give me this message
"Looks like you haven't paid off your device yet. Follow these steps to pay off your installment plan. Then, wait 48 hours before you submit a new request."
The problem is that I can't contact the previous owner and even if I do, I seriously doubt that he will finish paying it, also I could pay it myself but I need the credentials of the former owner that bought the phone from AT&T.
So, what can I do, what documents or proof do you need ? And how could we solve that issue ?
I try messaging you on Facebook, Tweeter and try to find an email address but it seems that you keep it well hidden, and no I can't call the customer service landline because I am living in Paris, FRANCE.
Thank you for your time and help,
Looking forward to read from you asap,