comScore has released their November 2011 U.S. Mobile Subscriber market share report, which reports key trends from the three months ending November 30, 2011. The Android and iOS platforms were the only platforms to grow from the quarter ending August 31, 2011 (with 3.1% and 1.4% growth respectively), with Blackberry (-3.1%), Windows Phone (-0.5%), and Symbian (-0.3%)  all continuing their decline.

Android continues to be the most used mobile OS in the US, with 46.9% of all smartphone users owning an Android smartphone. Apple retained the number two spot at 28.7% market penetration, followed distantly by RIM (16.6%), Windows Phone (5.2%), and Symbian (1.5%).

Judging by the last few comScore reports, Android still has plenty of room to grow, most likely at the expense of RIM as more and more enterprise customers are looking to trade in their Blackberries for Android devices. Android has become a powerful enterprise platform, and more and more businesses are recognizing that Android can provide enhanced smartphone functionality with many (or all) of the security features companies are looking for.

Regardless of the reasons, it’s good to see that Android continues to grow at seemingly exponential rates. There’s still plenty of room for growth by pulling customers away from RIM and other platforms, as well as pulling them from the feature phone market which still makes up the majority of cell phone users in the U.S.

We’ll likely see this growth continue for at least another quarter, as the impressive 3.7 million Android devices activated over the Christmas weekend have not yet factored into comScore’s numbers, and won’t until the next report, which is due out in February.

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