No service on my iPhone
I want my SIM card to be open
[Re-Titled by Moderator]
iPhone 7, iOS 15
Question marked as
If you see "No service" or "Searching" in the status bar you might not be able to make or receive calls on your iPhone if you have certain settings turned on, if your software isn't up to date, or if there's a problem with your network." Read this support article if you can‘t make or receive calls on your iPhone --> If you can't make or receive calls on your iPhone - Apple Support
With an iPhone 7 also look at this document:
iPhone 7 Repair Program for "No Service" Issues - Certain US and Asian models
iPhone 7 Repair Program for "No Service" Issues - Apple Support
BUT:
"The program covers affected iPhone 7 devices for 4 years after the first retail sale of the unit." iPhone 7 sold September, 2016 - September 2019 so eligibility will depend upon when exactly you bought your iPhone 7.