Abstract: The telephone watch (1) includes a back cover (2) in which is arranged a housing (3) arranged to accommodate a SIM card (4). A cover (5) provided with a hinge (6) closes the back cover (2). Means are implemented to assure the sealing (8) of the cover (5) and to assure the locking thereof (7). The hinge (6) is arranged so as to be entirely confined within the back cover (2).