The document discusses the mobile operating system market. It provides an overview of the mobile phones market and the major players in the mobile OS market including their market shares. Symbian, Android, iOS, and Blackberry OS are the major players. The revenue models of mobile OS companies include license fees, advertisements, and application purchases. Emerging trends suggest Android and Windows will grow their market shares while Symbian and Blackberry OS market shares will decline. The mobile OS industry faces high competition and bargaining power of customers.