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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 would not be surprised if some of the data used and conclusions are incorrect. The article said some percentage that are using 4G. I'll bet all of this is based on active phones. Would not be surprised if they are stupidly presuming 1 phone = 1 person. But the article didn't clarify that, or much of anything else. Tons of people own/use multiple phones.