Can’t make call or receive messages
Is that should be always updated with iOS ? To keep using own mobile how can be like this ?
iPhone 7
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Try first to optimize the range of the mobile network, see this Apple article:
If you see No Service or Searching on your iPhone or iPad
If you see No Service or Searching on your iPhone or iPad - Apple Support
If you still don't have a 'service' after that, see -> iPhone 7 Repair Program for "No Service" Issues
iPhone 7 Repair Program for "No Service" Issues - Apple Support
See also the following Apple articles:
If you can't make or receive calls on your iPhone
If you can't make or receive calls on your iPhone - Apple Support
Manually update your carrier settings on your iPhone or iPad
Manually update your carrier settings on your iPhone or iPad - Apple Support