A recent study conducted by comScore found that Apple’s iOS operating system grew at a faster rate than Android during the three-month period ended in June.

Android captured a 51.6 percent share of the U.S. smartphone OS market between April and June, slightly up from its 51 percent share in the three-month period ended in March. Apple’s iOS saw a small increase as well. iOS had a 32.4 percent in June, up from a 30.7 percent share. The two operating systems currently dominate the American smartphone market with a combined market share of 84 percent.

RIM’s BlackBerry OS fell to 10.7 percent, from 12.3 percent in the three-month period ended last March, but it still holds a large lead over Microsoft’s Windows Phone, which has only captured 3.8 percent of the U.S. smartphone market.

comScore also found that Samsung has the largest share of the U.S mobile market, with a 25.6 percent.share, but that’s down 0.4 percentage points despite the success of its brand new Galaxy S III handset. Fellow South Korea-based electronics maker LG holds the number two spot, with an 18.8 percent share of the market, followed by Apple with 15.4 percent.

Apple’s share increased 1.4 percentage points during the quarter and was the only manufacturer, besides HTC (6.4%, up .4 percentage points) that saw an increased slice of the pie.

[via: comScore]