I used Cellunlocker service for the first unlock I had to do on my own and it went without a hitch. It was easy peasy and would use it again and recommend to others as well. If I would have known about the service a few years back I would have saved myself a fair amount by unlocking a lost smartphone I found after being unable to locate its former owner. It turned out it wasn't a very good phone after using it for a few years but it was better than texting on a flip phone.
Bottom Line: Yes, I would recommend this to a friend