Cellular operators like Verizon Wireless and Cingular Wireless know, within about 300 yards, the location of their subscribers whenever a phone is turned on. Even if the phone is not in use it is communicating with cellphone tower sites, and the wireless provider keeps track of the phone's position as it travels."Live Tracking of Mobile Phones Prompts Court Fights on Privacy." By Matt Richtel, The New York Times, 12/10/05 (link omitted) <--- Althouse.
UPDATE:
What's described in this update requires the tracker to have physical access to the phone, plus he was in the U.K. Whether the same thing cand be done in the U.S. or elsewhere, we do not know. It's fascinating, however, to see what the technology can actually do.
For the past week I've been tracking my girlfriend through her mobile phone. I can see exactly where she is, at any time of day or night, within 150 yards, as long as her phone is on. It has been very interesting to find out about her day. Now I'm going to tell you how I did it."How I stalked my girlfriend'." By Ben Goldacre, The Guardian, 2/1/06.
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