Smartphone penetration has climbed to 70% of all adults in the United States (169 million people) in May, up 4% from February levels, according to recent data from comScore Mobile Metrix.

Apple ranked as the top smartphone manufacturer in the time period examined (March through May), with 41.9% of US smartphone subscribers (up 0.6 percentage points from the period ending February).

Samsung ranked second with a 27.8% market share (up 0.8 percentage points), followed by LG (6.5%), Motorola (6.3%), and HTC (5.1%).

Smartphone Platforms

Android ranked as the top smartphone operating system in May 2014, with a 52.1% market share, followed by Apple with 41.9% (up 0.6 percentage points from February), Microsoft (3.4%), BlackBerry (2.3%), and Symbian (0.1%).

Smartphone Apps

Facebook ranked as the top smartphone app in May, reaching 76.4% of the app audience, followed by Google Play (51.8%), YouTube (51.7%), and Google Search (49.2%).

About the research: The report was based on data from a combination of panel and census-based measurement methods.