I have been using the LG G5 phone since March 2017 connecting to WiFi without any problem. Since the WiFi has changed to optic fibre, I could not connect to WiFi anymore but kept switching it back to data. When I switched off the mobile data on my phone, then there wouldn't be any network connection.
My phone has no problem connecting to other WiFi when I am at friends' home.
Please advise what is the specific settings with Vodafone optic fibre.