I keep my microphone and camera off at the OS level always now. Android has quick options for it that you can add to your pull-down menu thing at the top. When I get an incoming call, a popup comes up asking if I want to allow voice permissions. Then after the call I disable it again. Same goes if I need to take photos.

I've never not believed that they listen to this shit. I've had far too many coincidental ad placements after saying something completely unrelated to anything I've ever searched for.