nasonic), Siemens, Samsung, Sharp, and SO on. The Symbian platform consists of a number of different versions of the core operating system (kernel). Versions nos. 6.0/6.1 are the most widespread os versions (with Nokia devices). The newer releases from Nokia are using versions 9.2 and 9.3. The Sony Ericsson on the other hand has based their UIQ offerings on versions 2.0 and 2.1. These various versions vary in functionality but are all based on the same core kernel with slightly different capabilities. The real distinction between available phones in the market can be found in the user interface. The Series 60 and UIQ user interfaces are the two main flavors of Symbian user interface. In addition there is a Series 80 and FOMA¹ SW platform but their impact in the market place is limited [4]. 10.3.2 Windows Mobile Windows Mobile from Microsoft has a market share of about 7-8%. Most often Windows CE (Windows Embedded Compact), Windows Mobile and Pocket PC are used interchangeably but these have different roles in the value chain. Windows CE is a real-time closed source os that provides a consistent and integrated tool set. Windows CE delivers a broad array of configuration and application options across a wide variety of devices, enabling broader choice for service and solution support. Windows Mobile is a targeted set of APIs and User Interfaces built on top of Windows CE to provide a platform optimized for personal mobile devices. In the case of Windows CE, the selection of the pieces and features is up to the individual device producers. In the case of the Windows Mobile, which is built on Windows CE, Microsoft selects the building blocks and components that need to be used. This enables a standard platform, regardless of the hardware, giving users the same experience 1 FOMA (Freedom of Mobile Multimedia Access) is the brand name of the 3G telecommunications services being offered by the Japanese telecommunications service provider NTT DoCoMo. Smart Wireless Devices regardless of device or operator and giving deve