Google has rapidly polished the software, and phone manufacturers have responded: More than 50 phones made by more than 20 manufacturers in 48 countries now run the operating system, up from just three models a year ago. In the U.S., Android phones are on all four of the major carriers.
Consumers are starting to respond, too: According to the latest report from Gartner, an industry research firm, Android-based phones outsold iPhones in North America for the first time in the first quarter of this year. Compared with the year-earlier period, Android phone sales grew an eye-popping 707 percent.
And analysts think that Android is only getting started.
"In a couple of short years, they are going to be the No. 2 operating system in the world — with virtually no marketing," Will Stofega, a smartphone analyst with research firm IDC, said of Android, putting it ahead of the BlackBerry OS and Apple iPhone.