Abstract: The invention provides the possibility of reducing the size of a mobile phone (1) by reducing the key set (7, 11, 12, 13). The invention provides a system and a method for mobile radio transmission by means of a mobile unit (1) which, for setting up a connection, has only one or more direct connection keys (7, 11, 12, 13), the initial activation of which in each case sets up a connection to a destination location assigned to one of the respective direct connection keys (7, 11, 12, 13). By activation of a central key (7) of the mobile unit (1), a connection (33) from the mobile unit (1) to a central switching device (30) is set up.