Google's (NAS: GOOG) Android mobile operating system closed out June 2011 controlling 40.1 percent of the U.S. smartphone market, up 2.0 percentage points month-over-month and increasing 5.4 percentage points since March 2011, research firm comScore reports. Apple's (NAS: AAPL) iOS was the only other mobile platform to grow during the period, increasing 1.1 percentage points over March to capture 26.6 percent of the U.S. smartphone segment.

Research In Motion's (NAS: RIMM) BlackBerry continues to slide, dropping another 3.7 percentage points between March and June to make up 23.4 percent of the U.S. smartphone market. Microsoft's (NAS: MSFT) Windows Phone platform fell from 7.5 percent in March to 5.8 percent in June (a 1.7 percentage point drop), and Symbian slipped from 2.3 percent to 2.0 percent. ComScore adds that 78.5 million U.S. subscribers own smartphones as of June, up 8 percent over the preceding three-month period.

Mobile data usage continues to increase, with 69.6 percent of all U.S. mobile subscribers sending text messages during the three-month period ending in June, up from 68.6 percent at the end of March. In addition, 39.5 percent of subscribers used downloaded apps (up from 37.3 percent), 26.9 percent played mobile games (up from 25.7 percent) and 29.1 percent accessed social networking sites or blogs (up from 27.3 percent).

Manufacturers shipped 51.9 million Android units in the second quarter, a 379 percent year-over-year increase, according to Canalys data issued earlier this week. Android is now the leading smartphone platform in 35 of the 56 nations that Canalys tracks, with an astounding 85 percent market share in South Korea and a 71 percent share in Taiwan.

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