No Sim Available on IPhone 12 Pro Max

Loribrock wrote:

I continually get a message “no sim available” and then I cannot dial out nor can anyone call me. I have to either turn my phone completely off, then turn it back on, or put the phone in airplane mode, then turn it back to normal. What is causing this and how can I fix it? My lastest update was 17.5.1

If this is a physical SIM you can remove it, wipe it off, re-install it.

Remove or switch the SIM card in your iPhone - Apple Support

Remove or switch the SIM card in your iPhone - Apple Support

If it is a bad SIM have your carrier send a new one.

for eSIM contact the carrier to re-provision the eSIM if you have issues—

Set up cellular service on iPhone Setup eSIM

Set up cellular service on iPhone - Apple Support

About eSIM on iPhone — Apple Support

About eSIM on iPhone - Apple Support

Find wireless carriers that offer eSIM service - Apple Support

Find wireless carriers and worldwide service providers that offer eSIM service - Apple Support