UX is an abbreviation for "user experience". Writing about UX design we mean the design of products and services in the knowledge of the habits, emotions, attitudes, perception and psychology's future. Thanks to detailed research we can create a tailored product or service, which is friendly and encourages to interaction. We need to understand user behavior not only when she/he using product but also before and after it. In follow article we deliberated this issue, focusing on several aspects of designing mobile applications in the context of these three stages.