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There is OpenSnitch [0] on Linux, but it us a bit clumsy to setup. I tried it once and didn't get far, but have it again on my todo list. Not aware of something else on Linux.

On Android there is NetGuard [1] which is awesome (not affiliated, just a happy customer).

[0] https://github.com/evilsocket/opensnitch

[1] https://netguard.me/

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My only gripe with Netguard is that it screws up roaming. With that enabled I couldn't access apps like my bank and various others when I was out of the country. Other than that, amazing piece of software.

There's a couple of options in settings worth checking, as Netguard works for me when roaming just fine.

Under Settings > Defaults, make sure you don't have "block roaming" turned on.

Expand the rules for the apps giving you issues, and check "Block roaming" isn't ticked for them.

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