ISO 13.3 failed verification update

The verification failed because your iPhone must have lost connection to the internet. Unable to Verify Update. [Software] failed verification because you are no longer connected to the Internet." Try updating your device again using the same network. If you still see one of these messages, try updating your device using another network or update your device with your computer. Get help with over-the-air iOS updates - Apple Support.

Axel F.

Phone 7 - No Service after iOS 13 update: Thats not good and I can understand that this can be very frustrating. Have you tried the steps listed in this link If you see No Service or Searching on your iPhone or iPad - Apple Support ? If that does NOT help then 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 .

You an also, as always, take your iPhone 7 to an Apple Store and have it examined. Good Luck.

Axel F.