VPN app for iOS. How to prevent traffic from flying without a VPN when the mobile network breaks?

Question

iOS

I want to install a program on my phone that will not give IP clearance in case of mobile communication breaks. Well, a simple example - I went to the subway, the VPN broke off, as soon as the connection appeared, the traffic is already going without VPN
A year ago, a person already tried to do about the same: How to make openVPN on iPhone via GSM always on?
But as you can see it didn't work out very well...

Answer 1

https://www.howtogeek.com/218851/how-to-enable-alw...