ComScore (http://www.comscore.com), which “measures the digital world,” has released new data from the comScore MobiLens service, reporting key trends in the U.S. mobile phone industry during the three month average period ending May 2012. The study surveyed more than 30,000 U.S. mobile subscribers and found Samsung to be the top handset manufacturer overall with 25.7% market share.

Google Android continued to grow its share in the U.S. smartphone market, accounting for 50.9% of smartphone subscribers, while Apple captured 31.9%. For the three-month average period ending in May, 234 million Americans age 13 and older used mobile devices. Device manufacturer Samsung ranked as the top OEM [original equipment manufacturer] with 25.7% of U.S. mobile subscribers (up 0.1 percentage points), followed by LG with 19.1% share. Apple continued to grow its share in the OEM market, ranking third with 15.0 percent (up 1.5 percentage points), followed by Motorola with 12% and HTC with 6.1%.

Nearly 110 million people in the U.S. owned smartphones during the three months ending in May, up 5% versus February. Google Android ranked as the top smartphone platform with 50.9% market share (up 0.8 percentage points). Five years after the release of the first iPhone, Appleā€™s share of the smartphone market reached 31.9% in May (up 1.7 percentage points). RIM ranked third with 11.4% share, followed by Microsoft (4%) and Symbian (1.1%).