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POPSThe pocket spy: will your smartphone rat you out? More: Sports Tracker also recorded what time I normally leave the house in the morning and when I return from work. "If I wanted more information, then I could just stalk you," says Neil Buck, a senior analyst at DiskLabs.… "Out of context, an individual piece of information such as an SMS is almost meaningless," says Jones. "But when you have a large volume of information - a person's diary for the year, his emails, the plans he's building - and you start to put them together, you can make some interesting discoveries."