How to fix 'No SIM' issue on iPhone?

Jokov wrote:

Woke up in the morning and discovered the "no sim" message on my iPhone 13 pro.

In the evening all worked fine.

Completed the steps from the help article (removing, inserting etc).

I inserted the same sim into my old iPhone Xr and it works in it all right.

I erased the iPhone 13 and before restoring it from the cloud backup moved the sim back to it. The iPhone accepted it without any issues.

So I moved to restoring the backup. After restoring "no sim" issue returned.

The question is:

Should it be enough to reset the carrier settings as one of the help articles suggests and use the restored back up, or should I set up the iPhone as new as this could be something else in the backed up version that creates the issue?

Thanks

[Re-Titled By Moderator]

ref: If you see 'invalid SIM' or 'no SIM' on your iPhone or iPad

ref: If you see SOS, No Service, or Searching on your iPhone or iPad - Apple Support

Settings>General>Transfer or Reset iPhone>Reset>Reset Network Settings <—————————RESET

If you see SOS, No Service, or Searching on your iPhone or iPad - Apple Support

ref: Put your iPhone in diagnostics mode - identify potential hardware and software issues

How to put your iPhone in diagnostics mode - Apple Support

Contact your Carrier ...

About eSIM on iPhone — Apple Support

About eSIM on iPhone - Apple Support

Set up cellular service on iPhone Setup eSIM

Set up cellular service 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