How can we unlock Samsung Galaxy S9 Plus with SM-G965U model that is locked AT&T USA network?

Firstly, you should check imei status of AT&T Samsung S9+, please make sure imei status is clean.

Secondly, you will insert non-AT&T sim into AT&T Galaxy S9 Plus, phone will ask Unlock code. This step helps us to check the sim slot status with good condition or not.

Thirdly, you will set up a stable internet, use an orginal USB cable, use a real Windows laptop/computer (a Windows tablet or Mac os can't help), install Teamviewer software into laptop/computer, then you will set up AT&T Galaxy S9+: turn on "USB debugging" funtion and connect phone and laptop via usb cable.

It will take 20-30 minutes to read Unlock code and Samsung Galaxy S9+ will be unlocked permanently, my service also supports Samsung Galaxy S9 with SM-G960U model.
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