My phone won’t connect to cellular data and I am unable to call out or receive calls.

"I am now able to use Wi-Fi, but can’t make or receive calls"

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Troubleshooting Calls:

A. Start Here: If you can't Make or Receive Calls on your iPhone - Apple Support

B. "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

C. Install a Cellular Update:

It might be prompting you for a cellular update to install. So, go here for that. Update your carrier settings manually on your iPhone or iPad - Apple Support

D. Update the iOS Using a Computer:

• Use my User Tip:  Update your iPhone Using a Computer - User Tip
• IMPORTANT: If you have an option to update, however, then be certain you backup your iPhone first. That way, you will have something to restore your iPhone from should anything go wrong with the update

"Why won’t my phone connect to cellular data so I can send and receive calls?"

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Troubleshooting "No Service":

Is "No Service" shown on the top-left corner of the screen?

What may have Happened:

• Find Out here: If you See No Service, Searching, or SOS on your iPhone or iPad - Apple Support
• As it reads: "If you see No Service or Searching in the status bar on your iPhone or iPad (Wi-Fi + Cellular), your device isn't connected to a cellular network."