Gillmor teaches digital hygiene classes where he tries to get people to think about their privacy and security. He usually starts the class by asking people if they know when their phones are communicating with cell towers. “Most people say, ‘When I use it,’ but the answer is, ‘anytime it’s on,’” he says.
LINK: https://gizmodo.com/i-cut-the-big-five-tech-giants-from-my-life-it-was-hel-1831304194