Can’t make or receive calla

Have you contact you carrier?

Contact your carrier

When you contact your carrier, make sure that:

• Your account is set up to use your iPhone.
• There aren't any localized service outages.
• Your account doesn't have a billing-related block.
• Your calls don't have errors on the carrier system.

Then -> Contact Apple Support

If you still can't make or receive calls, contact Apple Support, then follow the steps to complete your request.

Follow the steps in -> Related Article -> If you can't make or receive calls on your iPhone