No service

Click on this link 'If you can‘t make or receive calls on your iPhone' --> https://support.apple.com/HT204027

- "Find out what to do 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."

'If you see No Service or Searching on your iPhone or iPad' click here --> https://support.apple.com/HT201415

ramya96 Said:

"No service: My phone is now no service problem found am change the sim new one but same problem found"

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Contact your Service Provider:

See if your service provider is going through some issues with service.