Mine:
Iphone 7 Plus
Updated to IOS 14.2
Based in Leicestershire, UK
4G - no service, got signal 4 bars for 5 secs and back to no service
3G OK but when out and about some areas have no service
Update:
From the previous comment by @kvc suggested to delete the VPN.
I have NordVPN installed and deleted the app and in the Settings.
It seems OK and works for me.
Thank you!