This innocuous little button that you may sometimes use to wirelessly broadcast music to a local device or your car has now taken on a new sinister aspect after the upgrade. Other smartphones in the vicinity, in the pockets of other users, now have apps harvesting your Device ID, the unique ID that can be used to track down your telephone, and ultimately, you. Did you consent to this? Some technology experts even claim that with Bluetooth turned off, your telephone is still detectable by  other smartphones.

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