I currently have a Samsung S6 which I've been using for almost two and a half years now, and it's great. However, this morning I noticed that on the top right corner of the lock screen it shows "unregistered SIM".
This never happened before and I did turn off the device and put the sim card again, then power on again, and it still came up with the same message. Do you have any idea how can I fix it?
I also have this issue of an unregistered sim message. I have tried several methods to fix this issue such as resetting network settings, clearing cache, and even a factory set; however, nothing has worked. I also tried this sim on another device and it works. Any guidance will be much appreciated.