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The authors report a user study of over four months on the non-voice usage of mobile phones by teens from an underserved urban community in the USA where a community-wide, open-access Wi-Fi network exists. They instrumented the phones to record quantitative information regarding their usage and location in a privacy-respecting manner. They conducted focus group meetings and interviewed participants regularly for qualitative data. The authors present their findings on what applications their participants used and how their usage changed over time. The findings highlight the challenges to evaluating the usability of mobile systems and the value of long-term methodologies.
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