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As smartphone shipments topped the one billion mark for the first time in 2013, Android continues to dominate the market. According to , Google's open operating system was installed on almost 80 percent of all smartphones shipped in the past year, up from just 49 percent in 2011. Apple's iOS remains number 2 in the increasingly concentrated market, in which the market share of Windows Phone and BlackBerry OS remains in the low single-digits.