Abstract: A method of initializing a link between a mobile terminal of a public mobile network and a domestic base station, for example a public switched network base station, comprises authentication of the mobile terminal by the public mobile network, transmission of data for initializing the link with the domestic base station to the terminal from the public mobile network and transmission of the data from the mobile terminal to the domestic base station. The public mobile network operator can therefore manage the channels used by the mobile terminal for the link with the domestic base station. The method further assures authentication that is as secure as that of the public mobile network.

Abstract: A man-machine interface device for a telephone terminal for selecting options offered to the user when using services offering such options indicates to the terminal the various options that can be selected and determines, in a manner specific to each terminal, the mode of presentation of the options to the user for the purpose of making the selection.

Abstract: A mobile radio network provides additional services over and above a basic service. A public telecommunication terminal suitable for this network has provision for entry of terminal control data. The terminal recognizes additional service control data and prohibits action on data thus recognized.

Abstract: A terminal of a cellular mobile radio system cooperates with a user card and is able to operate in at least two separate operating modes, namely a normal mode in which it can be used with any user card and a locked mode in which it can be used only with the user card to which it is locked, the latter constituting a linked user card. To make use of the terminal more secure, first locking data is stored in a memory area of the linked user card and, in the locked mode, the method includes a phase of authentication by the terminal of the user card with which it is cooperating.

Abstract: To authorize the selection of a cell in a cellular mobile radio network terminal in the standby state, a parameter is calculated representative of the transmission quality with reference to that cell. If the parameter has a sufficient value relative to a cell selection threshold, setting up of a call involving said terminal is authorized in relation to that cell. If the parameter does not have a sufficient value relative to the cell selection threshold, but has a sufficient value relative to a cell deselection threshold, less than the cell selection threshold, some or possibly all of the functions relating to setting up of a call involving said terminal are authorized in relation to that cell.

Abstract: A connection seeking device in a terminal of a mobile radio system seeks connection of the terminal to one network of a system which includes a plurality of networks. The system extends over a plurality of geographical entities each having at least one network. The terminal is affiliated to a home network belonging to a geographical entity of origin. The device seeks the connection to the home network when the terminal is connected to a network which does not belong to the geographical entity of origin.

Abstract: A synchronization device for a terminal of a radio communication system, adapted to identify a control channel constituting one of a plurality of receive channels by means of a receiver (2) comprises means (3) to measure the power of the receive channels and means (4) for attempting synchronization to at least some of said channels identified in a list (5), and is characterized in that, the system being such that a reference channel (C.sub.r) of nominal power (P.sub.r), its ith predecessor (C.sub.r-1) and its ith successor (C.sub.r+1) have an ith attenuation (A.sub.i) when the receiver (2) is tuned to the reference channel (C.sub.r), it comprises selection means whereby the ith predecessor (C.sub.r-i) or the ith successor (C.sub.r+1) do not appear in the list if its power is less than the nominal power (P.sub.r) of the reference channel (C.sub.r) reduced by the ith attenuation (A.sub.i).

Abstract: Periodically, when a mobile is in its normal mode of operation, a first list of control frequencies transmitted by respective base stations of the geographical area in which the mobile is located is stored in a SIM card and a second list of control frequencies and associated respective maximal second receive levels measured by the mobile is stored in RAM. In response to being switched on, the mobile measures a first receive level for each of the control frequencies defined in the network and a comparator compares the first and second receive levels for each of the control frequencies of the second list, to assess movement of the mobile. To synchronize to a given network constituting a subnetwork of the radio communication network, the mobile uses the control frequencies defined in the radio communication network or the control frequencies from the first list, respectively, according to whether the mobile has moved or not.

Abstract: A mobile station of a mobile radio network includes speech exchange arrangements and data exchange arrangements. Selector arrangements select the speech exchange arrangements by default and change to the data exchange arrangements when necessary. The data exchange arrangements comprise a set of components for sorting, analyzing and processing the data and the commands exchanged between two terminal equipments so that a mobile terminal equipment capable of exchanging data according to a first standard (the V.24 standard+modem protocol, for example) can communicate with another, remote terminal equipment via a digital network using a second standard (V.110+GSM network, for example).

Abstract: A device for seeking a connection between a terminal and a mobile radio system includes a synchronization unit for establishing in response to a control signal if the connection can be achieved and a time-delay unit for producing, after an initial period, the control signal after a first waiting period. The time-delay unit produces the control signal again after a second waiting period if it is established that the connection cannot be achieved after the first waiting period. The time-delay unit fixes the duration of the second waiting period so that it is greater than that of the first waiting period. If the device is implemented in a terminal having a battery whose capacity is represented by a capacity indicator, the time-delay unit fixes at least one of the waiting periods according to the capacity indicator.