I can’t make or receive calls

Yvycdv Said:

"I can’t make or receive calls: I can’t make or receive calls on my iPhone 12 Pro max"

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Troubleshooting "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

No Success?

Contact your Carrier, as they are the one who provide you with the service of Cellularand Voicemail.

Perhaps this article will help:

If you can't make or receive calls on your iPhone - Apple Support