I am using Samsung Galaxy Premier(I9268) running CM 12.1. Several days ago, after some reboot, the phone Suddenly not recognize the SIM card. I have tried to use older updates, they all don't work. I have also tried to use the SIM on another phone, it is alright, proving that the SIM is OK to use. Can anyone tell me what problem I am having or help me solve that? Thanks a lot.