“At least 75 companies receive anonymous, precise location data from apps whose users enable location services to get local news and weather or other information, The Times found. Several of those businesses claim to track up to 200 million mobile devices in the United States”
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I use a RoadRunner ACME Brand, home-made, easily designed and created Farady cage.
Double up some heavy duty foil and wrap your phone it that. Pouch like. Only problem is, well, your phone is unusable.