Your phone battery is draining faster than usual. Your data usage spiked and you don't know why. An app appeared that you didn't install. These can all be normal phone behaviour — or they can be warning signs. In my security work I deal with device compromise regularly, and the honest truth is that most phones showing these symptoms are not hacked. But some are. Here are the 10 actual warning signs, what each one really means, and exactly what…
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