The latest comScore numbers were published on Thursday and revealed that Android is starting to lose ground to Apple (AAPL) in the United States. In a three-month period ending in February, Google’s (GOOG) operating system share fell two percentage points to 51.7% while iOS gained 3.9 points for a 38.9% share. BlackBerry’s (BBRY) market share continues to fall and now accounts for 5.4% of the market, however it is expected to gain some ground now that the BlackBerry Z10 is available. Adoption of Microsoft’s (MSFT) Windows Phone platform remained flat, increasing a mere 0.2 points for a 3.2% share of the market.

Comscore numbers

Following Apple’s lead in vendor share with 38.9% of the U.S. smartphone market was Samsung (005930) with a 21.3% share, an increase from 20.3% in November. The market shares of other Android vendors have continued to decline, however. HTC (2498) fell 1.7 points for a 9.3% share, while Motorola dropped about percentage one point to 8.4% and LG (066570) slid to a 6.8% share, down from 7% late last year.

ComScore numbers

As a whole, there are now more than 133 million people in the U.S. who own smartphones, representing 57% of the mobile market.