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. In the method, 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. Preferably, the navigator mode
uses wireless application protocol (WAP), and the language adapted to service data
is taken from the extensible markup language (XML) family, and in particular is
wireless markup language (WML). In a variant, the language adapted to service data
is hypertext markup language (HTML) or a language derived therefrom.