When i try to update my ios somethings pop up and it says failed verification you are not connected to the network even though i am connected to a wifi
iPhone 7, iOS 15
You need to be connected to WiFi as well as cellular if you want to update wirelessly.
Either fix the No Service issue, or update using a computer.
Update using your computer -
Click on this link for instructions on how to update your phone using a computer
Update iOS on iPhone - Apple Support