How can I unlock my iPhone 7 Plus that's locked to the original owner?
I bought an iPhone 7 Plus years ago, but now it's locked to the original owner. My daughter used it for a while, and when I tried to use it again, it was still locked. I contacted Apple Support with the invoice and payment receipt, but they didn't accept them as proof of purchase. I don't have any other documentation to unlock the device. What should I do?
[Edited by Moderator]