Download and install Mar-Elias Filter app on Android.
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An open source DNS based filter which controls the information flow in and out of an Android phone.
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It blocks pornography, evil and toxic domains. Popular websites containing pornographic material are also blocked.
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Blocked websites include: Twitter, Reddit images and wikipedia images.
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Safe search is enforced on Google while all other search engines are blocked.
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Not designed to work as a firewall (but it's possible to use it as one if used with iptables).