Last year's introduction of the iPhone 4S and the Kindle Fire have only further consolidated iOS and Android as the dominant mobile operating systems in the U.S. In smartphones, the operating systems accounted for 91% of all traffic in January, according to Jumptap. Meanwhile, Jumptap predicts that even with Nokia's coming introduction of a Windows phone, this plus the BlackBerry and Symbian systems will still account for less than 10% of impressions this year.

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