According to comScore, as of the end of 2015. nearly 200 million people in the United States owned a smartphone. This represented 80 percent of the mobile market:
“Apple ranked as the top OEM [original equipment manufacturer] with 42.9 percent of U.S. smartphone subscribers. Samsung ranked second with 28.4 percent market share (up 0.8 percentage points from September), followed by LG with 9.9 percent (up 0.5 percentage points), Motorola with 5.3 percent (up 0.5 percentage points), and HTC with 3.3 percent.”
“Android ranked as the top smartphone platform in December with 53.3 percent market share (up 1 percentage point from September), followed by Apple with 42.9 percent, Microsoft with 2.9 percent, and BlackBerry with 0.9 percent”.
And this table shows the popularity of the top 15 mobile apps.