When I use the phone it works for calls and texts, but then suddenly it will stop working and I will have to restart it or it will not see the SIM card. It shows the icon of no network. It specifically says “No Module”.
Same happen to me. I thought, I have a bad service provider.
I suspect that it is not the service provider because it fixes itself when the phone is restarted. This problem was also not present when I first got the phone. Did restarting your phone fix the problem with detecting the SIM card?