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This is why having a firewall installed is essential in every android phone. Afwall+ does the job. My phones are all rooted but if I'm not mistaken it works on non rooted phones as well.

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Nope, it requires root, as it should, really. Anything that can mess with networking at a low level needs root; there's no Android permission that I know of that lets you get down to iptables level.

There do exist "noroot" Android firewalls; I am not sure how they work (I think by somehow becoming interfaces - like "noroot" packet sniffers), but very probably not through `iptables`.

There are products on GitHub; I am looking at NetGuard (from, I think, Marcel Bokhorst aka M66B - the project has many forks). The .md says, «The only way to build a no-root firewall on Android is to use the Android VPN service».

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