Google and Apple continue to eat up more of the smartphone market, while RIM and Microsoft continue to lose ground.

According to new comScore data, 82.2 million people in the U.S. owned a smartphone as of July 2011, a full 10% increase from April 2011. Google is the market leader with 41.8% market share (up from 36.4% in April), while Apple is number 2 with 27% market share (up from 26%).

The news isn’t as bright for RIM, Microsoft or Nokia though. RIM’s BlackBerry was the big loser, as its piece of the smartphone market dropped from 25.7% to 21.7% in just 3 months. Microsoft also experienced a drop from 6.7% to 5.7%. Nokia’s Symbian OS, which is on its way to retirement, dropped from 2.3% to 1.9%.

comScore further reports that 234 million Americans 13+ use some type of mobile device, whether it’s a smartphone or not. Among the entire smartphone market, Samsung is the leader with a 25.5% share of U.S. mobile subscribers. LG and Motorola are next with 20.9% and 14.1% respectively. Apple is 4th with 9.5% of the total market, an increase of 1.2% since April. RIM rounds out the top 5 at 7.6%.

Among these 234 million mobile Americans, more of them are using their phones for varying tasks:

- 70% are texting (up 1.2% from April)

- 40% use their phones for web browsing (up 2%)

- 40.6% have used a downloaded app (up 2.8%).

- 30.1% are engaging in social networks

- 27.8% are playing mobile games and,

- 20.3% are listening to music

It’s difficult to predict what will happen to the mobile market in the next few years as it is one constantly evolving at an ever-increasing pace. One report asserts that Windows Phone will overtake iOS by 2015, but this is questionable.

For now though, Apple and Google are in a comfortable position, and it doesn’t look like there are any challengers ready to knock them off their perches.