Abstract: This apparatus (1) comprises monitoring means for an environment (2). These means are an integral part of a mobile telephone, for example. Thus, if an event occurs, a telephone communication takes place for another telephone apparatus (5). From the apparatus (5) it becomes possible to listen to what is occurring in the environment (2). According to one embodiment a communication is made periodically and, according to another mode, a communication is made as soon as an excessively intense noise occurs in this environment. Application: monitoring of young children.

Abstract: This apparatus (1) comprises monitoring means for an environment (2). These means are an integral part of a mobile telephone, for example. Thus, if an event occurs, a telephone communication takes place for another telephone apparatus (5). From the apparatus (5) it becomes possible to listen to what is occurring in the environment (2). According to one embodiment a communication is made periodically and, according to another mode, a communication is made as soon as an excessively intense noise occurs in this environment.

Abstract: The invention relates to the field of telecommunication networks of the GSM type. A telecommunication network comprises at least one terminal, for example 105, able to switch from idle mode to dedicated mode when a communication is established and a plurality of cells, for example 101 and 102, on which the terminal can camp in idle mode or dedicated mode and controlled by base stations, for example 103, intended to manage such a switching when a communication is established. One purpose of the invention is to avoid a terminal camping in idle mode on a cell on which it cannot camp in dedicated mode, because of a fault in the base station controlling this cell, at the time of switching.

Abstract: A proposal is made to lock the keypad by depressing keys (10, 11, 12 . . . ). However, to avoid inappropriate use of the apparatus, a sequence of keys called secret key sequence is to be depressed for the apparatus to become operational. In an advantageous manner this sequence is determined by the PIN code contained in the SIM card (30). Application to cellular telephony mobiles.

Abstract: The invention discloses a base station and various mobiles. At least one of the mobiles may also be connected to another system including a base station. This mobile has a list of all the systems to which it may be connected. In an advantageous manner, this list may be updated automatically.