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We present results from a longitudinal study of 34 iPh-one 3GS users, calledLiveLab. LiveLab collected unprecedented usage data through an in-device,programmable logger and several structured interviews with the participantsthroughout the study. We have four objectives in writing this paper: (i) sharethe findings with the research community; (ii) provide insights guiding thedesign of smartphone systems and applications; (iii) demonstrate the power ofprudently designed longitudinal field studies and the power of advancedresearch methods; and (iv) raise important questions that the researchcommunity can help answer in a collaborative, multidisciplinary manner.  We show how the smartphone usage changes over the year and why the users aredifferent (and similar) in their usage. In particular, our findings highlightapplication and web usage dynamics, the influence of socioeconomic status (SES)on usage, and the shortcomings of iPhone 3GS and its ecosystem. We further showthat distinct classes of usage patterns exist, and these classes are bestserved by different phone designs, instead of the one-size-fits-all phone Appleprovides. Our findings are significant not only for understanding smartphoneusers but also in guiding device and application development and optimizations.While we present novel results that can only be produced by a study of thisnature, we also raise new research questions to be investigated by the mobileresearch community.

Tales of 34 iPhone Users: How they change and why they are different