I have a Samsung galaxy s4 and I used to occasionally get "no SIM card detected, restart device" or something along those lines. In the last week, these messages keet increasing and it is annoying to always restart your phone and not have any signal. Now, the phone seems to recognize the SIM card (after several phone restarts and taking the SIM card out and putting it back in), but I have no reception. It's just a circle with a line through it. I don't know what's wrong.