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How do you know which one the app is doing? From my perspective the vpn was “on”

The easiest way would be to visit a website like "whatsmyip" and check that your IP address stays the same.

Not perfect, but you could connect to wifi, and look at the connections the phone makes.

Of course, it could change its behavior if it detects a cellular connection...

A better way would be to download the app and reverse engineer the binary.

And do that every single time there’s an update?

or download an open source version on f-droid