I updated to late IOS 15.0.2, now my iPhone 7 Plus cannot make or receive calls with Phone App, WhatsApp, or Facetime. Receive an error message Facetime Failed. Need help please.
And if khajotia's suggestion doesn't work, you may need to update your carrier settings.
Update your carrier settings on your iPhone or iPad
And if khajotia's suggestion doesn't work, you may need to update your carrier settings.
Update your carrier settings on your iPhone or iPad
Try a force restart:
https://support.apple.com/guide/iphone/force-restart-iphone-iph8903c3ee6/ios
iPhone 7 Plus cannot make or receive calls with, Phone App, WhatsApp, or Facetime
