1. A method of managing the operation of a mobile telephone in a telecommunications network, the method being of the type in which the mobile terminal is designed to operate selectively in a telephone call mode or in a navigator mode, and of the type in which display means, forming part of the mobile terminal or connected to the mobile terminal, are suitable for displaying a service data page formatted by a sequence of instructions in a language adapted to service data, the service data page giving access to at least one service, wherein a “preferred” mobile terminal operating mode is selected for implementing a service by incorporating a preferred mode selection instruction in the sequence of instructions for the service data page giving access to the service.