Android is on a roll. A staggering 81 percent of the smartphones shipped worldwide in the third quarter of this year were running Google's mobile operating system, according to technology research firm IDC. This is up from 74.9 percent during the same time last year, IDC found. Meanwhile, Apple's numbers fell. The worldwide market share of iOS, the operating system that powers iPhones, dropped during the third quarter to 12.9 percent from 14.4 percent, according to IDC. The reason is less than shocking: iPhones are freaking expensive. As the chart below shows, the average selling price for an iPhone last quarter was $635. But the average price for a smartphone running Android -- there are many manufacturers -- was only $268. "If you go to emerging markets, it's a price game," IDC Research Manager Ramon Llamas said, referring to countries like China and India. "Devices like [Apple's iPhone] and the new Bl
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