iPhone 13 issue
My IPhone 13 for no reason says no SIM card then SOS appears in upper right corner. I cannot receive calls they go to automated voice. I have turned phone off several times does not correct issues.
iPhone 13, iOS 17
If you've already tried taking out the SIM card and putting it back in, try converting your physical SIM to an eSIM by following this official guide: About eSIM on iPhone - Apple Support
If you're still having issues after following the guide, contact Apple Support: Contact - Official Apple Support