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Hundreds of smartphone apps are monitoring users through their microphones
(www.the-independent.com)
This is a most excellent place for technology news and articles.
Yes, but also no. You're underestimating advertisers' greed for data.
It's actually trivial nowadays to build a background service like that.
Which would show up in network traffic , which it doesnt. There is no need for it.
Ok, real question: what exactly would show up in network traffic?