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Apps Track Users When GPS Is Turned Off

Princeton researchers have developed a proof-of-concept app that can be used to reliably track users even if an app does not access a phone’s GPS data, and the user has purposely turned off GPS services.

Researchers say this is possible because modern phones come with a large number of accurate sensors that track a wealth of data that could be corroborated with external sources —such as elevation maps and weather data— and reconstruct a user’s movements.



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