It isn't always a virus that gets into the phone.
A lot of apps carry adware/malware that **** with your DNS and are pretty much undetectable by any A/V scans.
Google cracks down on a lot of these apps but there are just so many so people are bound to get one eventually.
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I've never gotten that in my years of owning androids. Just don't download sketchy apps or apps that ask for permissions they shouldn't need. If I try to download a game or some app and it asks for permissions to make calls and all this crap, I don't download it.