My iPhone calls keep dropping

If you are unable make a call or receive; If you can't make or receive calls on your iPhone - Apple Support

uzma171 Said:

"I can’t make calls: Why my calls keep dropping"

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Troubleshooting Cutting-Out Calls:

"No Service":

Is "No Service" shown on the top-left corner of your screen? If so, go here to fix that: If you See No Service or Searching on your iPhone or iPad - Apple Support