ComScore (http://www.comscore.com), which “measures the digital world,” has released data from the comScore MobiLens service, reporting key trends in the U.S. mobile phone industry during the three-month average period ending June 2012.

The study surveyed more than 30,000 U.S. mobile subscribers and found Samsung to be the top handset manufacturer overall with 25.6% market share. Google Android continued to grow its share in the U.S. smartphone market, accounting for 51.6% of smartphone subscribers, while Apple captured 32.4%.

For the three-month average period ending in June, 234 million Americans age 13 and older used mobile devices. Device manufacturer Samsung ranked as the top OEM [original equipment manufacturer] with 25.6% of U.S. mobile subscribers, followed by LG with 18.8% share. Apple continued to gain share in the OEM market, ranking third with 15.4% of mobile subscribers (up 1.4 percentage points), followed by Motorola with 11.7% and HTC with 6.4% (up 0.4 percentage points).

More than 110 million people in the U.S. owned smartphones during the three months ending in June, up 4% versus March. Google Android ranked as the top smartphone platform with 51.6% market share (up 0.6 percentage points), while Appleā€™s share increased 1.7 percentage points to 32.4%. RIM ranked third with 10.7% share, followed by Microsoft (3.8%) and Symbian (0.9%).