Method for locking to the user's card in a portable radio telephone

Claim 1

A method for the use of a mobile radio telephone, especially a portable radio telephone usable in a general telephone network and having not only the radio telephone parts but also a processor (4), with a non-erasable read/­write memory (5), which controls and supervises the opera­tion, a keyboard (7) and a display (6), and a card reader (3), in which case, when the radio telephone is being set up for a call, the user identification data required by the radio telephone system are read in the card reader (3) from the card (1) of the user at any given time, characterized in that the identification data (21) of the card (1) of one specific user authorized to use the radio telephone in question are recorded in the memory (5) of the processor, whereupon the radio telephone shifts to the locked mode, locked to this user's card, in such a way that the use of the radio telephone in the mode locked to the user's card is possible only with the help of the card (1) designated for it, and that the unlocking, whereupon the apparatus shifts back to the unlocked mode, is possible only with the help of the card the identification data (21) of which were recorded in the processor memory (5) at the time of shift­ing to the locked mode.

Claim 2

A method for the use of a mobile radio telephone, especially a portable radio telephone usable in a general telephone network and having not only the radio telephone parts but also a processor (4), with a non-erasable read/­write memory (5), which controls and supervises the opera­tion, a keyboard (7) and a display (6), and a card reader (3), in which case, when the radio telephone is being set up for a call, the user identification data required by the radio telephone system are read in the card reader (3) from the card (1) of the user at any given time, characterized in that the identification data (21) of the card (1) of one specific user authorized to use the radio telephone in question are recorded in the memory (5) of the processor, whereupon the radio telephone shifts to the locked mode, locked to this user's card, in such a way that the use of the radio telephone in the mode locked to the user's card is possible only with the help of the card (1) designated for it, and that the unlocking, whereupon the apparatus shifts back to the unlocked mode, is possible only with the help of the card the identification data (21) of which were recorded in the processor memory (5) at the time of shift­ing to the locked mode.