Nothing has changed on my phone, my SIM was not removed and yet mid day I received a notification that I'm on emergency calls only - no SIM inserted. I have tried resetting network settings, inserting the sim after removing and restarting my phone. Nothing has changed. I am a single parent at home with an infant, I have to have service.
Best answer by Sophia
It could be that the SIM card shifted a little (not likely) or packed it in (rare, but happens). Do you have another phone you can try the card in?
Also, make sure you check self server to see if anything odd is going on with your account and no one has stolen your account…
Lastly, did you pay your bills? I know it sounds like an odd question but… we all forget things at times