The mobile telecommunication apparatus (1) comprises a microphone (4), a loudspeaker (3), a transmitter/receiver (7), a control circuit (8) with a memory (9) and a control interface (5, 6) with a display (2). The mobile telecommunication apparatus (1) comprises in memory a collection of so-called personae (10) containing control and viewing parameters associated with each persona, a personae editor (11) designed for read/write access to the parameters of the said collection of personae, and an operating system (12) designed to be executed right from startup by the control circuit (8) in such a way as to drive the personae editor (11) so as to view a so-called main persona on the display (2).