A method for configuring a mobile terminal wherein a basic configuration for use of the mobile terminal in differently organized communication networks is set up in the mobile terminal. The basic configuration for use of the mobile terminal in a particular communication network of the communication networks is modified by a change, for which purpose data for a configuration specific to the particular network is loaded into the mobile terminal. The change remains available during the use of the mobile terminal in the particular communication network. Correspondingly a suitable mobile terminal and a suitably embodied mobile radio network implement the method.