Abstract: The invention relates to a user interface of a player of a mobile device (10). The user interface comprises graphical icons (16) representing the functions of the player, of which icons only the ones that can be performed in the current mode of operation of the player are shown on the display (11) of the device. Each of the graphical icons shown on the display is associated with one of the keys (12, 13, 14) of the device. In addition, the user interface comprises, in at least two languages, operating instructions, which are saved in the memory of the device as a text file. The invention also relates to a method and computer program product for implementing the user interface of a player.