comScore just released data from the comScore MobiLens service, reporting key trends in the U.S. mobile phone industry during the three month average period ending May 2010 compared to the preceding three-month average.

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, and reviewed the most popular activities and content accessed via the subscriber's primary mobile phone.

The May report found RIM led among Smartphone platforms with 41.7 percent market share while Samsung proved to be the top cell phone manufacturer overall with 22.4 percent of the market.

Next in Smartphones was Apple's iPhone - but not the new iPhone 4 which launched after the May reporting period - way behind at 24.4 percent, a 1 point drop from the previous reporting period.

Below that was Microsoft at 13.2 percent follow by a bullish Good Android at 13 percent flat, the only Smartphone platform to show growth - a healthy 4 point rise over the previous report.

Palm rounded out the top 5 Smartphone platforms at an anemic 4.8 percent.

In regular non-smart handset OEMs, Samsung's 22.4 market share was closely followed by LG at 21.5 percent, then Motorola at 21.2 and RIM and Nokia in the single-digit percentile.

The comScore report also revealed that 65.2 percent of U.S. mobile subscribers used text messaging on their mobile device, up 1.4 percentage points versus the prior three month period, while browsers were used by 31.9 percent of U.S. mobile subscribers (up 2.3 percentage points). Subscribers who used downloaded applications comprised 30.0 percent of the mobile audience, representing an increase of 2.1 percentage points from the previous period. Accessing of social networking sites or blogs also saw significant growth, increasing 2.6 percentage points to 20.8 percent of mobile subscribers.