Wifi and data do not work

On the whole VPN is a Very Bad Thing. Something to think about→Don't use VPN services. · GitHub

There are two legitimate purposes for using VPN:

• To allow access to a private network such as a school or business when you are not on site. 
• To allow access outside of a country with a repressive government that has restricted Internet access.

Any other use is risky, and can lead to problems like the one discussed in this thread. VPN disguises your location by making you appear to be somewhere else in the world. But you can’t control that “somewhere else”, and if it is in a location that an app isn’t approved for the app won’t work. Plus the fact that the provider of the VPN knows everything about you and your location, as well as what sites you access through the VPN. So you are totally dependent on the VPN provider’s honesty. As a start, if the VPN is free, DON’T USE IT. The provider has to make money somehow, and if you aren’t paying them then they are selling your private data to make money. But even those that charge can’t necessarily be trusted.

You don’t really need VPN when using public Wi-Fi, because all communications between your iPhone and the servers it accesses are end-to-end encrypted.

Most likely you have run out of data for your mobile plan - but you still have the option turned on hence why is still says 4g but you have no connection.

Double check the WiFi settings to make sure your connected and if all else fails you can reset the network settings.

NOTE: resetting network settings deletes saved WiFi and their passwords.

Hi,

Might be something in this Apple support article that will help > If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network - Apple Support