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Text messaging remains the top activity done by U.S. cell phone owners, according to a study conducted by Pew Internet; 91% of Americans own a cell phone, which is quite an incredible statistic. And of these Americans who are sporting a wireless handset, 81% have used it to send or receive text messages. Just don't do it while driving...
Source: http://www.phonearena.com/news/Vast-majority-of-stateside-cell-phone-users-love-to-text_id47604