NSA Tracks Turned-Off Phones — But Phone Makers Don't Know How -- Tom's Guide
Tracking a cellphone is easy, especially for the National Security Agency. But can you track a cellphone that's been turned off?
It sounds impossible, but the NSA apparently has been able to track powered-down mobile phones since 2004, as reported by The Washington Post in July 2013.
The Post's mention of this ability was brief. It was buried within a longer narrative regarding the NSA's partnership with the U.S. military's Joint Special Operations Command (JSOC) to track and kill high-profile al-Qaida targets in Iraq:
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Update: Nokia and Samsung say they can’t track powered-down phones despite NSA claims -- The Verge
My Comment: Apparently Apple has a patent on how this can be done.
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