Apple's iPhone and Google's Android might seem to have all the momentum these days, but RIM's BlackBerry OS is the surprise winner in StatCounter's latest U.S. mobile OS Internet usage numbers.BlackBerry Bible: Everything You Need to Know About Your RIM SmartphoneThe BlackBerry OS grabbed a 34.4% share, overtaking Apple at 33% in November, according to the Web analytics company's research arm. \u00a0Apple's share was nearly 52% a year ago."These figures suggest that developers should not be developing solely for the iPhone to the exclusion of BlackBerry and Android," said Aodhan Cullen, CEO of StatCounter, in a statement.Also read: Employees armed with Facebook, smartphones among biggest company boosters\u00a0BlackBerry's latest big product introduction was its Torch smartphone, which was one of the most searched on shopping terms of 2010, according to AOL.\u00a0Meanwhile, according to StatCounter, Google's Android's share of the U.S. market rose to nearly 24%, triple what it was a year ago.Gains for Google Android have been a recurring finding by industry watchers this year. For example, recent research from NPD and Canalys showing Android demand on the rise, largely at the expense of RIM. \u00a0Comparing these researchers' findings (as well as ChangeWave's) isn't quite apples to apples, however, since some are measuring smartphone purchases and planned purchases vs. StatCounter's numbers on actual usage.Microsoft's Windows Phone 7 failed to register on StatCounter's survey, though that's not surprising since WP7 only became available in November.\u00a0"You can never underestimate Microsoft but it looks to have its work cut out," said Cullen.Worldwide, the Symbion OS has the top share at about 32%, followed by iOS at about 22%, BlackBerry OS at 19.3% and Android at 11.6%.StatCounter Global Stats are based on data from a sample of more than 15 billion page views per month collected from across its 3 million website-strong network.Read more about anti-malware in Network World's Anti-malware section.