how do i unlock device if it blacklisted
Hello. I am not a customer of at&t company. Please help me. One person sold to me apple iphone 7plus 128gb with IMEI ***XXXXXXX and serial number ***XXXXX blocked (sim lock) by at&t company. i cloud not blocked. he said that his sister gave him this device. When I use the unlock service (https://www.att.com/deviceunlock/?#/unlockstep1), it's notify me that this mobile phone was lost ot stolen. PLEASE answer me is it true? was this phone really lost or stolen? please give me more information about this device. is it possible to unlock this device? and how can i do it?
Thank you to find time to handling my request. If I can provide you with any further information, please let me know.