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