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Smartphone Users and Penetration Worldwide, 2016-2021 (billions, % change and % of mobile phone users) | Insider Intelligence
Digital 2014: Half of the World's Population Now Has a Mobile Phone — DataReportal – Global Digital Insights
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Data shows the number of smartphone subscriptions has more than doubled during the last five years / Digital Information World
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Smartphone Ownership and Internet Usage Continues to Climb in Emerging Economies | Pew Research Center
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Research Peek of the Week: Smartphone Users in the US Expected to Reach Over 270 Million by 2022 - Internet Innovation Alliance
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