comScore (http://www.comscore.com), which measures the digital world, released data from the comScore MobiLens service, reporting key trends in the U.S. mobile phone industry over the three month period between September and December 2009.

According to the stats, Apple was the second largest smartphone vendor in the US in December. The report ranked the leading mobile original equipment manufacturers (OEMs) and smartphone operating system (OS) platforms in the U.S. according to their share of current mobile subscribers age 13 and older, as well as the most popular forms of content and activity accessed via mobile device.

The report found Motorola to be the top handset manufacturer with 23.5% market share, while RIM led among smartphone platforms with 41.6% market share.

A total of 234 million people age 13 and older in the U.S. used mobile devices in December 2009. Device manufacturer Motorola was the top ranked OEM with 23.5% of U.S. mobile devices. LG ranked second with 21.9% share, followed by Samsung (21.2%t share), Nokia (9.2 \% share) and RIM (7.% share).

RIM was the leading mobile smartphone operating system in the U.S. in December 2009 with 41.% share of U.S. smartphone devices. Apple ranked second with 25.3% share (up 1.2 percentage points), followed by Microsoft with 18% share, Palm with 6.1% share, and Google with 5.2% share (up 2.7 percentage points).