This bachelor thesis is focused on design and execution of user interface of mobile applications for the Windows Phone operating system. The main objective is to extend the MMSP methodology by the support of mobile applications' user interface design. Another objective is to compare user interface of the major mobile operating systems (Anroid and iOS) with Windows Phone, and thus to identify advantages of Windows Phone user interface for ordinary users. The thesis is divided as follows: the first part describes user interface of the major mobile operating systems and identifies advantages of the Windows Phone operating system for ordinary users by comparing it with the rest of the major operating systems. The thesis further deals with execu...