After some research online about which unlocking company to use I went for Simply Unlocked due to the previous reviews I read. This was a simple process with a one off payment (beware there are other companies out there who look for additional money before releasing the unlock codes). From start to finish the whole process took 48hrs approx, partly due to me placing the order on a Friday night. When I received the unlocking codes for my Samsung S8 and followed the simple instructions everything worked 100%, the phone has since been sold, unlocked, to its happy new owner. Defo recommend Simply Unlocked, it worked for me and great value.