lost internet connection after software upgrade
how to restore internet connection after recent version update
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Wi-Fi:
If Wi-Fi will not connect
· Reset the router to factory settings (menu or paper clip)
· On iphone Settings, General, Transfer iphone or reset, reset, reset network settings
· If you have a VPN you are strongly recommended to uninstall it and its profile in Settings, General, VPN and device management
Here's some more steps you can try for Wi-Fi connection issues that may be helpful if your phone will not connect to WiFi
If your iPhone, iPad or iPod touch won't connect to a Wi-Fi network – Apple Support (UK)
Cellular/Mobile
Support article: If you see No Service, Searching, or SOS on your iPhone or iPad - Apple Support
Go through the various suggestions in the support article above but if they don't help, and your network carrier can't help, then contact Apple Support for further investigation. You should be able to reach them here
Contact - Official Apple Support
or phone numbers
Contact Apple for support and service - Apple Support