It doesn't even require anything that complex. If I remember correctly, even if your smartphone never connects to wifi AP's, while thhe WiFi radio is on, it doe

It doesn't even require anything that complex. If I remember correctly, even if your smartphone never connects to wifi AP's, while thhe WiFi radio is on, it does periodically scan for AP's in the area while either surrendering some identifiable information or establishing a pattern that can be used to identify you. Frak it, TV is going in a Faraday cage