Here are some key points from ComScore's U.S. Mobile Market share survey:
>Apple's smartphone market share soared to 25.3 percent in December 2009, up 8.5 percentage points from the year ago period
>Google's smartphone share "gained considerably in the final months of 2009 and is poised for continued growth in 2010 with the introduction of new devices featuring the Android platform."
>Smartphone market penetration "continued to climb" in 2009 with smartphones accounting for 17 percent of mobile phone subscribers in December 2009, up nearly 6 percentage points from one year ago.
>RIM, with its BlackBerry device, retained the top market share position with 41.6 percent of the smartphone market in December 2009 followed by Apple at 25.3 percent.
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