The aim of this thesis is an analysis of current mobile operating systems. The theoretical part will focus on the most popular operating systems that are designed for mobile devices. The introduction will explain terms such as smartphone, mobile operating system, and part is focus to the history and development of smartphones. Further I will deal with major players in the market for operating systems. The aim is to describe in detail their characteristics, summarized the pros and cons and then compares these systems in my pre-defined criteria. In the introduction, I present analytical representation of the mobile platforms in the world market. The practical part consists of a questionnaire survey focused on the share of mobile platforms on ...