Global marketing and advertising research company Nielson on Thursday said in its latest survey that Google\'s Android operating system (OS) continued to dominate the U.S. smartphone market in June. According to Nielson\'s June survey of mobile consumers, the Android OS claims the largest share of the U.S. consumer smartphone market with 39 percent. Apple\'s iOS is in second place with 28 percent while RIM Blackberry is down to 20 percent. Microsoft\'s Windows Phone 7 OS had a 9 percent share of the market while HP webOS (Palm) accounted for 2 percent as did Nokia\' s Symbian. In Nielson\'s May survey, 38 percent of smartphone consumers had a device powered by Android, compared to 27 percent for Apple\'s iOS for iPhones and 21 percent for RIM Blackberry. Talking about the manufacturer share, Apple is the No.1 in the U.S. as it is the only company manufacturing smartphones with the iOS, said the report. Other leading manufacturers include HTC, whose Android phones represents 14 percent of the smartphone market and whose Windows Mobile/WP7 devices accounted for 6 percent of the market. Motorola\'s Android devices are owned by 11 percent of smartphone consumers. Samsung\'s Android devices are used by 8 percent of smartphone consumers and its Windows Phone 7 devices take a 2 percent share, said Nielson.