Comscore: Android still top US smartphone OS, but iPhone top smartphone and iOS gaining

Despite some handwringing over Apple’s (s AAPL) somewhat slowing iPhone growth, its share of smartphone subscribers has continued to rise in its biggest market: the U.S. On Wednesday ComScore published a report taking the temperature of the smartphone market in Apple’s home country and it is at No. 1 with a 37.8 percent share of the market. Samsung, Apple’s biggest rival, is in second place, but isn’t really that close behind with a 21.4 percent share.

Apple’s share represents 3.5 percent growth compared to the last time ComScore issued this report in October 2012. And unless you missed Apple’s earnings results from the December holiday quarter, you won’t be surprised at that growth¬†since Apple sold 48 million iPhones worldwide¬†between October and December.

ComScore OEM smartphone US

But while the company is leading in hardware sales, iOS is still far behind the Android(s GOOG) juggernaut. Even though it fell 1.3 percent between October and December to 52.3 percent share, Android still is the most popular smartphone operating system in the U.S. Apple’s share grew 3.5 percent to a 37.8 percent share of mobile operating systems among smartphone owners, says ComScore.

ComScore smartphone OS US

Still, even in the face of evidence that Apple is doing well now, some people who watch the company and its stock are worried about what comes next and whether the company can continue to post quarterly gains of iPhone sales in established markets like the U.S. as the device nears its sixth birthday.