It seems America is getting hooked on the smartphone. We depend on these modern Swiss Army knives for everything from planning our schedules to checking the news, finding entertainment and managing our social networks. Oh, and they also make calls -- a fact that's sometimes forgotten these days as text messages become a preferred means of communication for younger generations. (Nearly 90 percent of teen cell-phone users send and receive texts, according to the Pew Internet & American Life Project; on average, they send 50 messages per day.)

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