4,868,846
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`United States Patent ts
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`[11] Patent Number:
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`Kemppi
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`Sep. 19, 1989[45] Date of Patent:
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`[54] METHOD FOR LOCKING TO THE USER’S
`CARD IN A PORTABLE RADIO
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`TELEPHONE
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`Inventor: Yrjé Kemppi, Salo, Finland
`[75]
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`[73] Assignee: Nokia Mobira Oy, Salo, Finland
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`[21] Appl. No.: 221,079
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`[22] Filed:
`Jul. 19, 1988
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`[30]
`Foreign Application Priority Data
`Jul. 29, 1987 [FI]
`Finland....
`sesesssanseanee 873309
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`Lint, CUS cccesssssssccsceecee
`HOIM 11/00
`[51]
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`P52] US. CMe ccccsssssssssssssssssaseccsnseeceesees 379/144; 379/91;
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`235/382; 235/486; 340/825.31
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`[58] Field of Search ..scssssssssees 379/144, 91; 235/380,
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`235/382, 486; 340/825.31, 825.33, 825.34
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`References Cited
`U.S. PATENT DOCUMENTS
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`4,439,670 3/1984 Bosset et al. oo... csceeeeee 235/382
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`4,480,181 10/1984 Fisher..........
`we 235/486
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`4,670,746 6/1987 Taniguchi et
`340/825.31
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`4,759,056 7/1988 Akiyama......
`we 379/197
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`4,811,387
`3/1989 Hollewedet al.
`- 379/144
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`3/1989 Reichardt et al. 0... 235/482
`4,814,593
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`[56]
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`FOREIGN PATENT DOCUMENTS
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`0254316
`1/1988 European Pat. Off. ......... 235/486
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`5/1988 France .....ssssssessssssssensaseesene 235/486
`2607290
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`7/1983 Japam orcs: 235/486
`O125178
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`2164227 3/1986 United Kingdom .
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`Primary Examiner—Robert Lev
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`Attorney, Agent, or Firm—Armstrong, Nikaido,
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`Marmelstein, Kubovcik & Murray
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`ABSTRACT
`[57]
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`Theinvention relates to a methodfor the use of a porta-
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`ble radio telephone, which has a processor (4) control-
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`ling and supervising the operation, a keyboard (7) and a
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`display (6), and a card reader (3), in which case, when
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`the radio telephoneis being used, the user identification
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`data required by the radio telephone system are read
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`from the card (1). The identification data (21) of the
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`card (1) of the user authorized to use the radio tele-
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`phone concerned are recorded in the non-erasable
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`memory (5) of the processor (4), whereupon the radio
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`telephoneshifts into a mode locked to this card in such
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`a waythat its use is possible with only a certain card (1).
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`By means ofthis method, protectionis achieved against
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`unauthorized use of the radio telephone.
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`3 Claims, 2 Drawing Sheets
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`4 MAGNETIC
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`CARD
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`MICROPROCESSOR
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`DISPLAY
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`TELEPHONE
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`MEMORY
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`1 of 5
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`SAMSUNG EXHIBIT 1006
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`1 of 5
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`SAMSUNG EXHIBIT 1006
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`US. Patent—Sep. 19, 1989 Sheet1 of 2 4,868,846
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`4
`MAGNETIC ©
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`CARD
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`MICROPROCESSOR—DISPLAY
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`4,
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`CARD ID
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`DATA
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`10.
` 11
`1h
`15
`16
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`13
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`FIG. 2
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`CARD
`NUMBER
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`+
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`a3
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`LOCKING CODE
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`22
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`20
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`COMPARISON
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`31N
`CARD esr aren
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`CAPDen
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`32
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`30
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`FIG. 3
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`US. Patent—sep.19, 1989 Sheet20f2 4,868,846
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`MEMORY
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`Sa
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`PROCESSOR
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`5D
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`MEMORY
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`RADIO UNIT
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`CARD
`READER
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`3
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`METHOD FOR LOCKING TO THE USER’S CARD
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`IN A PORTABLE RADIO TELEPHONE
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`1
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`4,868,846
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`15
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`2
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`According to the invention it is also possible to use
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`for the locking for example a four-digit code by means
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`of which the card locking is activated. The locking
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`codeand theidentification code on the card may also be
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`recorded in the indelible memory of the telephone.
`After the card is fed in, the identification code on the
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`card is compared with the identification code recorded
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`in the memory, and whenthecardis the correct one the
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`telephone functions normally but, in the case of a wrong
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`card, operation is prevented. The unlocking can be
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`done with the same card as was used for activating the
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`locking, by keying in the correct locking code.
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`A mobile radio telephone may be made upofa sepa-
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`rate operating apparatus (a handset) and a radio unit,
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`each of them having a separate processor. In this case
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`the locking concerns both the operating apparatus and
`the radio unit.
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`By this solution a protection has been achieved in
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`which both the operating apparatus and the radio unit
`are locked to the same card, in which case not even the
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`stealing of the operating apparatus alone would be
`worth while.
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`In the event that the operating apparatus does not
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`have its own separate processor, the locking is imple-
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`mented in the processor which controls the wholetele-
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`phone. Such one processor apparatus could be, for ex-
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`ample, hand telephones without a separate operating
`unit.
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`The card locking can be implemented completely via
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`the program. The card locking is seen on the userinter-
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`face as only one locking level, which the user may
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`select when he so desires. All that is needed additionally
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`is routines for the identification comparison and for
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`preventing the functioning of the telephone.
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`The user card may be a plastic card, the size of a
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`_ credit card, provided with a magnetic strip, or some
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`other card suitable for the purpose, for example a so-
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`called “intelligent” card provided with a processor.
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`The method according to the invention is described
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`below with the aid of an embodiment example depicted
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`in the drawing.
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`In the drawing,
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`FIG.1: a block diagram of the principle of a portable
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`radio telephone to the extent that it pertains to the in-
`vention;
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`FIG.2: a representation of the principle of the identi-
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`fication data contained in the user’s magnetic card;
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`FIG. 3: an illustrative picture of the comparison of
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`the locking code in the memory and the code whichis
`fed in; and
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`FIG. 4: a block diagram of the principle of a portable
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`radio telephone when the apparatus is made up of a
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`separate operating apparatus and a radio unit.
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`The method worksin such a way that, when the user
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`wishes to lock the radio telephone depicted as a block
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`diagram in FIG.1 to a certain magnetic card 1, he feeds:
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`the card into the magnetic card reader 3 in the tele-
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`phone,activates the locking by pressing the locking key
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`8 in the keyboard, and keys in a four-digit locking code
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`from the keyboard 7. At this time the telephone number
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`(FIG. 2) or its part 12 on the card 1 is recordéd, to-
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`gether with the locking code 22, into the indelible mem-
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`ory 5 of the telephone. (The data contained in the mag-
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`netic. card depicted in FIG. 2 pertain to the use of the
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`radio telephone system, which is not explained here in
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`greater detail.)
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`When the magnetic card 1 is fed into the card reader
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`3 the next time, before the initiation of the registration
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`The invention relates to a mobile radio telephone,in
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`particular to a method for the use of a portable radio
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`telephone operating in a public radio telephone network
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`which has not only the radio telephone parts but also a
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`processor which controls and supervises the operation
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`and has a non-erasable read-write memory, a keyboard
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`and a display, and a card reader, in which case, when
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`the radio telephoneis set up for a telephone connection,
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`the user identification data required by the radio tele-
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`phone system are read from the present card inserted in
`the card reader.
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`One example of such a radio telephoneis the tele-
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`phone working in the German NETZ-C network.
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`The magnetic card required for the use of a NETZ-C
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`radio telephone is a plastic card, the size of a normal
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`credit card, provided with a magnetic strip. This card
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`has all the information required by the system regarding
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`the user. The possessor. of the card may feed his card
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`into any NETZ-C telephone anduse the telephone with
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`his ownidentification code, without the system know-
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`ing anything about the origin of the telephoneitself.
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`Owing to the above, stealing a portable telephone
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`may become tempting. If the thief is not caught red-
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`handed, tracing the telephonelater is nearly impossible.
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`The object of the invention is to provide sufficient
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`protection in the telephoneitself against unauthorized
`use.
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`According to the invention, this protection is imple-
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`mented by means of the system by recording in the
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`memory of a portable radio telephonethe identification
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`data of the card of one specific user authorized to use
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`the radio telephone concerned;whereupon the radio
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`telephone shifts to the locked mode, locked to this
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`user’s card, in such a way that the use of the radio tele-
`40
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`phone in the mode locked to the user card is possible
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`only with the help of the card designated for it, and that
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`unlocking, whereupon a shift is made back to the un-
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`locked mode,is possible only with the help of the card
`the identification data of which were recorded in the
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`45
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`memory of the processor at the time of shifting to the
`locked mode.
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`Protecting a telephone against unauthorized use is
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`knownperse, but the question has always been of lock-
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`ing the telephone apparatusitself or its operation. How-
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`ever, the locking of the telephone apparatus alone does
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`not provide sufficient protection, since opening the
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`locking codeis in principle possible by experimenting
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`with a sufficient number of codes, if the telephoneal-
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`lowsthe locking code to be keyed in using any card.
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`According to the invention, the radio telephone thus
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`has, available for the user to choose, a locking level the
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`activation of which locks the telephone to the magnetic
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`card in the card reader at that moment. Thetelephone
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`functions completely normally as long as the correct
`60
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`card in in the telephone, but if an attempt is made to use
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`the apparatus with a wrong card, its operation is pre-
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`vented. If the telephone locked to a card is stolen to-
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`gether with the card, calls made using the card con-
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`cerned can be prevented at the system level.
`65
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`In another embodiment of the invention, a locking
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`key is provided in the keyboard for the user to press in
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`order to shift the radio telephone to the locked mode
`and outofit.
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`4 of 5
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`4 of 5
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`4,868,846
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`4
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`the disadvantages. of
`According to the invention,
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`locking, mentioned earlier, have been
`conventional
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`eliminated in such a way that the telephone will not
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`register in the network and will not accept commands
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`from the keyboard,
`i.e.
`the telephone is completely
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`“dumb”, if a wrong card 1 is fed into the card reader3.
`I claim:
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`1. A methodfor use in a mobile radio telephone oper-
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`able in a general telephone network having radio tele-
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`phone parts, a processor, a non-erasable read/write
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`memory which controls and supervises operation, a
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`keyboard,a display, a card reader, and a readable card,
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`said method comprising the steps of:
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`setting up said radio telephone for a call;
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`reading user identification data required by said tele-
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`phoneinto said card reader from said card;
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`recording said identification data of said card of a
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`specific user authorized to use said radio telephone
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`into said memoryofsaid processor;
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`shifting said radio telephone to a locked mode;
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`locking said card into said radio telephone, wherein
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`said step of locking of said card is such that the use
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`ofsaid radio telephonein said locked modeis possi-
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`ble only with the use of said card which is specifi-
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`cally designated for said radio telephone; and
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`shifting to an unlocking mode, wherein the step of
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`shifting to said unlocking mode is possible with said
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`card having said identification data having been
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`recorded in said memory at the time ofshifting to
`said locked mode.
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`2. A method according to claim 1, wherein the step of
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`shifting to the locked mode andout of it comprises the
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`step of pressing a locking key arranged in the keyboard.
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`3. A method according to claim 1 or 2, wherein the
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`step of shifting to the locked mode andoutofit further
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`comprises the step of keying in a several-digit code.
`®
`x
`&
`*
`&
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`3
`into the network the card number 21 recorded in the
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`memory 5 and the number31 in the card whichis fed in
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`are compared. If the numbers agree in the comparison
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`of FIG. 3, the operation proceeds normally. But,if the
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`card 1 is wrong,i.e. 4’-8’ (31) differ from numbers 4-8
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`(21) the telenumbers phone will not register in the net-
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`work and will not accept any commands from the key-
`board 7. Thus the unauthorized use of the radio tele-
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`phone, without the correct magnetic card 1, is more or
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`less completely prevented. It is possible to unlock the
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`card locking by activating the unlocking by means of
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`key 8 in the keyboard and by keying in the locking code
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`22 given at the time of the locking.
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`The operation ofthe parts of the radio telephone and,
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`for example, the keying in, recording and comparison of
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`the numbers are controlled by a microprocessor uP (4)
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`in a manner known perse, not explained here in greater
`detail.
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`Since according to FIG.4 the mobile radio telephone
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`is made up ofa separate operating apparatus (= handset)
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`and a radio unit, each having its own processor 4a and
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`4b, the locking concerns both the operating apparatus
`and the radio unit. This means that the same identifica-
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`tion code (shown in FIG. 3 has been recorded in the
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`indelible memories 5a and 5b of both the operating
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`apparatus and the radio unit. After the feeding in of the
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`card 1, both the operating apparatus and the radio unit
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`compare the identification information in their memo-
`ries to both the identification code received from the
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`card and that keyed in. Thereafter the processors of
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`both units exchange information regarding the correct-
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`ness of the identification code according to a certain
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`data transfer protocol; both processors must agree re-
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`garding the correctnessofthe identification code before
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`a call is initiated normally.
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`15
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`45
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`50
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`55
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`65
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`5 of 5
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`5 of 5
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