More and more users are using mobile devices and the Internet of Things. Especially for children and young people, these technologies are becoming increasingly popular. Many children prefer mobile devices and use desktop computers less. Adult users also prefer to access the Internet and communicate from their mobile devices than from desktop computers. The article aims to find out how the use of mobile devices has changed in recent years and what time pupils and students use mobile applications. The respondents' estimate was compared with the actual time of using mobile devices during the day. This article describes the possibilities of using mobile applications in teaching, especially in study courses dealing with programming and development of mobile devices. The questionnaire survey focused on how students evaluate courses and how students perceive the education of mobile application development. The observation method was also used. The motivation and activity of the students during the case studies was monitored. Research shows that mobile devices and mobile applications can serve as suitable learning tools. Case studies conducted with high school and university students describe the possibilities of teaching mobile application development. These studies show opportunities in teaching the development and use of mobile technologies. Results confirm more efficient teaching of algorithmization and programming.