ComScore (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 July 2012. Among the results: Apple’s share of the U.S. smartphone market grew to 1-in-3 subscribers.

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 lead among smartphone platforms, accounting for 52.2% of smartphone subscribers, while Apple secured 33.4%.

For the three-month average period ending in July, 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 18.4% share. Apple continued to gain share in the OEM market, ranking third with 16.3% of mobile subscribers (up 1.9 percentage points), followed by Motorola with 11.2% and HTC with 6.4% (up 0.4 percentage points).