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Digital 2014: Half of the World's Population Now Has a Mobile Phone — DataReportal – Global Digital Insights
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Increasing Penetration of Mobile Phones, Smart Phones and Tablets Stimulate Mobile Gaming Growth - Euromonitor.com
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Smartphone Ownership Is Growing Rapidly Around the World, but Not Always Equally | Pew Research Center
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Smartphone penetration worldwide by country for age group 55+, from... | Download Scientific Diagram
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