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If you've ever used a smartphone to find, say, the nearest sushi restaurant, it should come as no surprise that the phone can track your own location.
Well, two researchers say the iPhone continues to keep track of you even when you think you've turned off the location services, and NPR's Martin Kaste says that no one quite knows why.
MARTIN KASTE: You can turn off the GPS function on your iPhone, but it can still figure out its location by looking at nearby cell phone towers and Wi-Fi signals. And now, it turns out the iPhone is constantly recording that information and tucking it into a hidden file.
Mr. ALASDAIR ALLAN (Computer Researcher): That's the thing that most upsets me.
KASTE: Alasdair Allan is a computer researcher who recently stumbled across the file. Looking at the file produced by his own iPhone, he was surprised by how detailed it was: for nine months, his iPhone logged its location up to 1,000 times a day. http://www.npr.org/...r-physical-positions