Friend of a friend retired several years ago from Intel. He'll go into detail about all the ways you're being spied on. He won't let you into his house with a smartphone; you have to turn it off and leave it in your car.
I used to think he was just paranoid...
> He won't let you into his house with a smartphone
His mistrust might be about the phone's owner and the recording apps they might use, more than the smartphone itself.
Socially it's much safer to direct suspicion at "the smartphone" rather than the people invited to your house.
> He'll go into detail about all the ways you're being spied on.
Don't doubt it for even a second.