(Technology Review) The sensor that lets your phone know which way the screen is oriented also—thanks to minute manufacturing variations—emits a unique data “fingerprint” that could allow your phone to be tracked, even if all other privacy settings are locked down, researchers say.

In addition to governing basic things like screen orientation, accelerometer data is widely used by apps such as pedometers and mobile games. Meanwhile, many apps often rely on advertising, which has led advertisers to search for ways to track users and their Web habits.

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