I can’t receive or make calls.

iPhone 7 - No Service after iOS 13 update: Thats not good and I can understand that this can be very frustrating. Your iPhone 7 may be part of the iPhone 7 Repair program and you can check whether you qualify by using the information in this link ➔ iPhone 7 Repair Program for "No Service" Issues - Apple Support .

Good Luck.

Axel F.

Perhaps this article will help;

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

Then try this

If you see No Service or Searching on your iPhone or iPad - Apple Support

Does it show "No Service" in the top left corner of your iPhone 7?

Axel F.