Currently, six major platform providers (i.e., providers of operating systems and development tools) dominate the mobile platform market (Holzer and Ondrus, 2010). They are Nokia with its Symbian OS, Google with its Android, Apple with its iOS, RIM with its
Blackberry OS, Microsoft with its Windows mobile OS family (the latest being Windows Phone 7), and LiMo Foundation with its Linux Mobile operating system. Symbian OS has the largest market share, but does not have the largest number of available apps, or a centralized app store, which makes it difficult to provide a comprehensive review of existing Symbian OS m-health apps.