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4.3 Billion People Now Own Smartphones
(www.gizchina.com)
This is a most excellent place for technology news and articles.
I'd like to see an age breakdown.
2.6 billion people are under 20, nearly a billion are over 60. I'd expect those age groups are less likely to own smartphones.
So, the rate for people between 20 and 60 might be closer to 90%.