The use of mobile devices is increasing in recent years, and their characteristics are different from those of computers (keyboard and screen size, interaction method, etc.), so it is important to specifically study the usability of these devices. This paper presents an experiment carried out with users to find the correct length (from the point of view of usability) of hyperlinks in mobile devices. A real mobile device has been used for the experiment, as well as more than 20 users. The experiment compared three different lengths of hyperlinks and it concluded that users prefer hyperlinks as short as possible and they are identified better when the text is not justified.