Last week, I reported on how the number of mobile devices is exploding worldwide. But coming up with an estimate for the total number of smartphone handsets sold this year is difficult, and numbers vary depending on the source. A report by Smart Analytics stated 43 million smartphones were shipped worldwide by July 1, 2009. Conversely, international market research firm Research and Markets estimated 159 million smartphones were shipped in 2009.Part of the reason for the varying numbers is that
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