iPhone will not make telephone calls
iPhone will not make or receive telephone calls
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"iPhone will not make or receive telephone calls"
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Troubleshooting iPhone Calls:
A. Go Here: If you can't Make or Receive Calls on your iPhone - Apple Support
B. "No Service":
"No Service" is shown on the top-left corner of your screen. So, go here to fix that: If you See No Service or Searching on your iPhone or iPad - Apple Support
C. Whom to Contact:
Contact your Carrier, as they are the one who provide you with the service of Cellular.