comScore released a report on the May 2010 mobile subscriber marketshare in the US, and found that Google's Android operating system managed to steal marketshare from all other major smartphone platforms. This report doesn't take the iPhone 4 into account yet though, as this phone wasn't available until June.
49.1 million people in the U.S. owned smartphones during the three months ending in May, up 8.1 percent from the corresponding February period. RIM was the leading mobile smartphone platform in the U.S. with 41.7 percent share of U.S. smartphone subscribers, followed by Apple with 24.4 percent share and Microsoft with 13.2 percent. Google saw significant growth during the period, up 4.0 percentage points to capture 13.0 percent of smartphone subscribers, while Palm rounded out the top five with 4.8 percent. Despite losing share to Google Android, most smartphone platforms continue to gain subscribers as the smartphone market overall continues to grow.