Android and iOS continue gobbling market share at the expense of Research In Motion’s BlackBerry, according to comScore’s MobiLens report, which surveys more than 30,000 U.S. mobile subscribers. The report includes a three-month period ending July 2011.

Android reached 41.8 percent market share her in the United States, while Apple strengthened its No. 2 position with 27 percent of the smartphone market, up 1 percentage point from the prior reporting period. RIM ranked third with 21.7 percent share, a drop of 4 points, followed by Microsoft (5.7 percent) and Symbian (1.9 percent).

Samsung emerged as the top handset manufacturer overall with 25.5 percent market share, up one point from the prior reporting period. LG followed Samsung at a close second with 20.9 percent share. Motorola took third with 14.1 percent share. Apple strengthened its position at the No. 4 spot with 9.5 percent share of mobile subscribers (up 1.2 percentage points), while RIM rounded out the top five with 7.6 percent share.

So what were mobile users doing with their devices? According to the report, 70 percent of U.S. mobile subscribers used text messaging on their mobile device, up 1.2 percentage points. Browsers were used by 41.1 percent of subscribers (up 2 percentage points), while downloaded applications were used by 40.6 percent (up 2.8 percentage points).

Use of social networking sites or blogs increased 2.1 percentage points to 30.1 percent of mobile subscribers. Game-playing was done by 27.8 percent of the mobile audience (up 1.6 percentage points), while 20.3 percent listened to music on their phones (up 2.3 percentage points).

The report concludes that more than 80 million Americans owned smartphones as of July 2011.