I have an iPhone SE. As soon as I click connect on my vpn my WLAN disconnects imidealty and goes to 4G unless I turn it off

I have an iPhone SE. As soon as I click connect on my vpn my WLAN disconnects imidealty and goes to 4G unless I turn it off

Take it to your carrier store. It's an issue with them

This is actually a visual bug, most of the time when I enable VPN, it "disables" Wi-Fi but it is actually still connected. You can check this by going to your Wi-Fi settings and it will show you're still connected.

I also done a speed test after this as my 3G is far slower than my Wi-Fi. The test showed a speed way too high for it to be my 3G so it must be on Wi-Fi despite the status bar saying 3G