Cellphone signals can also by use to depict a visitors walk through a shopping center.
The technology can tell when people enter a shopping centre, what stores they visit, how long they remain there, and what route they take as they walked around.
The device cannot access personal details about a person’s identity or contacts, but privacy campaigners expressed concern about potential intrusion should the data fall into the wrong hands.
The surveillance mechanism works by monitoring the signals produced by mobile handsets and then locating the phone by triangulation – measuring the phone’s distance from three receivers.
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