Though smartphone usage was gradually increasing prior to the launch of Apple’s iPhone in 2007, the adoption rate of these devices has accelerated in exponential ways during the past half-decade. Whereas the device was once reserved for a small subset of the population, generally limited to serious business owners and other professionals who needed on-the-go email services, today the smartphone is used by people in virtually all professions, at all experience levels, for any number of diverse reasons. Proliferation of these devices has become the thing of headlines: As of 2013, 40 percent of all people under the age of 55 own a smartphone. That number jumps to a staggering 75 percent of the population when the age group is limited to those under 35 years of age. Even older individuals, those over 55, stand a one in four chance of owning a smartphone device of some sort.
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http://www.associationofmarketing.org/articles/view.php?article_id=13945