I just saw this on the Washington Post.
Quote:
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It’s not clear what triggers data collection — the men theorize that it could be text messages, calls or traveling between cell towers, since data isn’t being collected from every place they’ve walked through. They believe the information is being collected deliberately, but do not know why.
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This is apparently a feature of the 3G versions of these devices. The full story is here:
http://www.washingtonpost.com/blogs/...wpisrc=nl_tech