On Wednesday, comScore, Inc., a leader in measuring the digital world, released data from the comScore MobiLens service, unveiling trends in the U.S. mobile phone industry during a three month period between October 2009 and January 2010. According to the January report, Motorola was the top handset maker with 22.9 percent market share, while Research In Motion led the smartphone segment with 43.0 percent market share.

According to the research firm, it ranks leading mobile original equipment manufacturers (OEMs), as well as smartphone operating system (OS) platforms in the U.S., in accordance with the share they enjoy among current mobile subscribers that are aged 13 or older. Moreover, the report also takes into consideration popular activities and the content mobile customers access via their handset.

“In the 3 month average ending in January, 234 million Americans were mobile subscribers ages 13 and older, with device manufacturer Motorola ranking as the top OEM with 22.9 percent of U.S. mobile subscribers. LG ranked second with 21.7 percent share, followed by Samsung (21.1 percent share), Nokia (9.1 percent share) and RIM (7.8 percent share),” the report from comScore shows.

In the OS segment, RIM was the leader in the time frame, with 43.0 percent share of U.S. smartphone subscribers, marking a growth of 1.7 percentage points when compared to the previous three months. According to comScore, 42.7 million mobile phone users in the U.S. owned a smartphone in the time frame, an increase of 18 percent when compared to the August through October period.

According to the report, Apple was ranked second during the three months period in the smartphone operating system area, accounting for 25.1 percent market share (up 0.3 percentage points), while Microsoft came in third with 15.7 percent share. Google accounted for 7.1 percent of the OS market (up 4.3 percentage points), while Palm enjoyed 5.7 percent. comScore also notes that Android has seen fast growth, and it should continue to do so, it seems. Additional details on the January report are available here.