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Cellphone users say they want more privacy, and app makers are listening. No, they're not listening to user requests. They're literally listening to the sounds in your office, kitchen, living room and bedroom. A new class of smartphone app has emerged that uses the microphone built into your phone as a covert listening device -- a "bug," in common parlance. But according to app makers, it's not a bug. It's a feature! The apps use ambient sounds to figure out what you're paying attention to. It's the next best thing to reading your mind.