The document discusses the market share and key features of major smartphone operating systems. It states that in 2010, Symbian comprised 47.2% of smartphones shipped, followed by Blackberry at 20.8% and iPhone at 15.1%. It then provides details on the history, versions, development platforms and app stores of Symbian, iPhoneOS, Android, Blackberry OS and Windows Mobile. It concludes by introducing Mobile Programming LLC, a company that provides custom mobile app development services across various platforms.