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.
I would expect them having access to that anyway when they control the device, or when they are the manufacturer
If that data were encrypted it would at least reduce the number of people that has access to it.