The simplest way to avoid physical tracking of your cellphone by ad networks is to turn off your Wi-Fi and Bluetooth when out walking around.
When, in 1975, Stafford Beer argued that "information is a national resource," he was ahead of his time in treating the question of ownership -- just who gets to own the means of data production, not to mention the data? -- as a political issue that cannot be reduced to its technological dimensions.
I have to stop myself from thinking about how many aspects of technology I don't understand.
Now any aspiring startup can rely on Verizon's infrastructure of ubiquitous connectivity and geolocational tracking to match supply and demand, with Verizon itself providing lucrative verification and locking services. Verizon hopes to eventually extend this model far beyond cars, making it possible to swap any other items fitted with an electronic lock: power drills, laptops, apartments. Verizon -- hardly a Silicon Valley pioneer -- thus joins many other champions of the "sharing economy" in insisting that "people today are embracing a sharing society -- the one that allows them to get what they want on demand". Gone are the burdens of ownership!
A federal investigation of the Gaylord Opryland Resort and Convention Center in Nashville found that Marriott employees had used "containment features of a Wi-Fi monitoring system" at the hotel to prevent people from accessing their own personal Wi-Fi networks.
If your strategy is to prevent your customer from leaving you, you probably shouldn't have had those customers in the first place.