No internet connection

Hi,

I noticed you are currently running iOS 14. I would highly recommend updating to iOS 15.1.

If the issue persists after updating, reset your network settings.

Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings

https://support.apple.com/en-us/HT212712

Possible outcome is a weak signal.

Toggle Airplane mode on/off to force your iPhone to search for a signal.