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Nokia and Samsung say they can’t track powered-down phones despite NSA claims

The Verge
Publication date: 
Tom Warren
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Earlier this year, The Washington Post claimed that the National Security Agency (NSA) had developed a method nine years ago to locate cellphones when they were powered down. The publication didn’t provide technical details on the software or hardware involved, leaving security researchers puzzled by the revelations. Seeking clarification on the technologies invoked, British privacy watchdog Privacy International conducted a survey of eight cellphone manufacturers in August to obtain details on how it would be possible to track a cellphone once it’s turned off.