Android, Apple lead U.S. smartphone market, others play catch-up

The Android operating system's share of smartphone sales grew to 53% from January through October, up from 42% in 2010, and Apple's iOS share rose to 29%, up from 21% last year, research firm NPD Group said.

Research in Motion, which makes the BlackBerry, continued to see its share of the smartphone market decline, plummeting to 10% in the first 10 months of this year. In 2010, it held one-fourth of the market. Windows Mobile, Windows Phone 7, Symbian OS and Palm/webOS had tiny shares of the market, with each operating system capturing no more than 3%.