Scientists in Germany have demonstrated a startling new form of surveillance: identifying people using nothing more than ordinary WiFi signals. By analyzing how radio waves bounce around a room, researchers can effectively “see” and recognize individuals — even if they are not carrying a device and even if their phone is turned off.
It’s a “costs extra feature” for the customer. But, they have access to it regardless of whether it’s “turned on”. It’s never turned off for them. And, if that puts me in tin-foil hat territory, so be it.