Make sure your phone asks for a network unlock code before ordering. iPhones are not supported under this service
Make Sure Your Devices Must Be Locked To UK O2 Network. Don’t Put NON O2 Devices, It Will Be Rejected After Given Time Frame, Tesco Not Supported
This is a slow service. The code will take 1 to 14 days typically
If you need fast service for Samsung then order here: https://unlockmysim.com/unlock-phone/samsung-united-kingdom-nck-mck-rgck/