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A few short years ago, most mobile devices were, for want of a better word, "dumb." Sure, there were some early smartphones, but they were either entirely e-mail focused or lacked sophisticated touch screens that could be used without a stylus. Even fewer shipped with a decent mobile browser capable of displaying anything more than simple text, links, and maybe an image. This meant if you had one of these devices, you were either a businessperson addicted to e-mail or an alpha geek hoping that this would be the year of the smartphone. Then Apple changed everything with the release of the iPhone, and our expectations for mobile experiences were completely reset.
Charland et al. (Fri,) studied this question.