Holder of a mobile telephone

The device has a microphone and a loudspeaker situated in a lower part (105) and an upper part (106) of a mobile telephone in a vertical position, respectively. A telephone enclosure (3) supports the telephone with the microphone in a vertical manner with respect to a rigid plate (2) such that the plate defines a sound cord that extends from the upper part of the telephone towards the microphone. The rigid plate fastens the device to a user.