The latest numbers from research firm comScore show that Android devices accounted for 51% of all used in the United States in the first quarter of 2012, the first time comScore has found that Android has accounted for more than half of all smartphones used in the U.S. over a given quarter. 's iOS accounted for 30.7% of all smartphones used in Q1 2012, while Research in Motion's BlackBerry OS accounted for 12.3%. Quarter-over-quarter, RIM saw its share of the smartphone market decline by 3.7 percentage points, while Android saw its share increase by 3.7 percentage points. Or put another way, Android's rise in market share in the quarter was the exact same number as RIM's decline over the quarter.

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ComScore also found that Samsung, which produces the Galaxy line of Android smartphones, was the top overall manufacturer in the U.S., accounting for 26% of all smartphones used in the quarter. LG (19.3% of all smartphones used in the quarter), Apple (14%), Motorola (128%) and HTC (6%) all rounded out the top five manufacturers on the quarter, comScore found.

While Android has been a tremendously successful mobile operating system for consumer smartphones, it has lagged behind Apple in both the enterprise smartphone market and the overall tablet market. According to the latest numbers released by mobile enterprise tech firm Good Technology, iOS devices accounted for around 80% of new activations on corporate networks in the first quarter of 2012, while Android-based devices accounted for just 20%. No other mobile platform, such as Mobile, registered enough activations on the quarter to crack Good's study, which tracked mobile device activations across thousands of companies that registered at least five activated mobile devices.