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We interviewed 21 people both before and after they acquired an iPhone 3G or T-Mobile G1 to assess how nextgeneration smart phones impact user behavior. We focused on exploring what motivates people to use their smart phones, what applications they use, what information they access or produce, when and for how long they interact with their phones, and how this usage relates to other tasks and devices. Our results suggest that the use of nextgeneration mobile phones depends heavily on contexts, particularly users’ other devices and the places and situations users encounter. We observed that users employ their mobile phones in concert with, not independent of, their other computers. Rather than just mimicking desktop use, however, they employ their phones in different ways and for new tasks. The places and situations in which users employ their phones shape the tasks they undertake and how they …