I cannot receive or make calls
Cannot make or receive calls
iPhone 6, iOS 10
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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
Also read this slightly different list of possible reasons and things to try if you see No Service, Searching, or SOS on your iPhone or iPad --> If you see No Service, Searching, or SOS on your iPhone or iPad - Apple Support