A radiotelephone terminal unit is provided for a subscriber who has a
portable radiotelephone terminal of the mobile network type or cordless
telephone type which can be carried around by a user and by means of
which the user communicates via a communication network to which the user
is connected by radio via a relay transceiver station. The unit includes
a radiotelephone terminal which is complementary to the portable
radiotelephone terminal, preferably remains in place, and can be used
conjointly with the portable radiotelephone terminal when connected to
the relay transceiver station by a call set up via the station.
Complementary functions of the two terminals can be employed by the same
user having simultaneous access to both terminals.