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There’s also another aspect that the author does not consider properly. Phones are hacked physically or remotely, using different techniques. A custom os can prevent any generic Android attack and could also mitigate any specific exploit. Let’s say that a remote or even a local to root exploit could affect a version of android, it’s highly probable that the attack cannot work as is, on a custom os. We are not talking about a custom cooked rom, but a recompile of the kernel and the System. Any attack would be specific and possibly with a very short life. Attacking a blackphone would cost much more.

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