JP2008028792A - Cell-phone terminal and additional function limit method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To more reliably make a use limit of an additional function of a cell-phone terminal after a cancellation to a cell-phone entrepreneur. <P>SOLUTION: This cell-phone terminal is a detachable module and can be used by loading a module in which an identifier IMSI (International Mobile Subscriber Identity) allocated fixedly to a user is written. It is determined upon a startup of the cellphone terminal whether or not an entrepreneur code coincident with an enterprise code of the identifier IMSI of the module is recorded in predetermined information of the module. When it is determined that the enterprise code coincident with the enterprise code of the identifier IMSI is recorded in the predetermined information of the module, a use of the additional function except a communication function is limited. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a mobile phone terminal, and more particularly, to use restriction of an additional function other than a communication function attached to a mobile phone terminal after a user cancels a contract with a mobile phone operator.

  Recent mobile phones are equipped with advanced functions such as a still image / moving image shooting function and a digital terrestrial television broadcasting (so-called one-segment broadcasting) receiving function as additional functions other than the function of making a call. In the present mobile phone, these additional functions can be used even after the user cancels the contract with the mobile phone operator.

  Mobile phones in Japan are set at a low price for general users. In addition, existing mobile phone terminals after the release of mobile phone terminals with new functions are often priced down and free of charge.

  Therefore, the user can obtain various additional functions as described above mounted on the mobile phone terminal at an inexpensive price. As a result, some general users have purchased additional functions of mobile phone terminals at an inexpensive price by canceling the contract with the mobile phone operator immediately after purchasing the mobile phone terminal. There is.

  Therefore, as a countermeasure for avoiding the above-described problems, for example, in a mobile phone terminal that is not normally waiting for a base station, the use of the additional function, for example, viewing of terrestrial digital television broadcasting is disabled. It is considered to be.

  However, in this method, when there is a user of a mobile phone terminal in a so-called out-of-service area where communication with the base station cannot be performed, the user has not canceled the contract with the mobile phone operator. There is a problem that the additional function as described above cannot be used.

  On the other hand, conventionally, a mobile phone terminal can be used by loading a detachable module, for example, an IC card, in which subscriber information (subscriber phone number, etc.) as information that is the basis of use permission is recorded. A system for doing so is known. In the ITU recommendation regarding the IMT-2000 system, a medium (module) for storing the subscriber information is called a UIM (User Identity Module). In a GSM (Global System for Mobile Communication) system used in Europe, this module is called a SIM (Subscriber Identity Module) card. In 3GPP (3rd Generation Partnership Project), this module is called a USIM (Universal Subscriber Identity Module) card. Therefore, in the following description, this card is referred to as a USIM / SIM card.

  When a USIM / SIM card is loaded into a mobile phone terminal compatible with the USIM / SIM card, the mobile phone terminal uses the subscriber information recorded on the USIM / SIM card to make and receive calls. Is possible.

  Therefore, in the system using the USIM / SIM card, since the subscriber information is contained in the USIM / SIM card, any mobile phone terminal can use the same subscriber information to call by loading the USIM / SIM card. And communication (for example, see Patent Document 1 (Japanese Patent Laid-Open No. 2005-175798)).

  However, even if no USIM / SIM card is loaded, the additional function can be used conventionally.

  As a technique for solving the above-described problems related to the additional function for a mobile phone terminal compatible with this type of USIM / SIM card, for example, Patent Document 2 (Japanese Patent Laid-Open No. 2006-74111) discloses that a USIM / SIM card is not loaded. It has been proposed to disable the use of additional functions in the state, such as camera functions.

The above-mentioned patent documents are as follows.
JP 2005-175798 A JP 2006-074111 A

  However, even if the use of additional functions when the USIM / SIM card is not loaded is restricted as described above, at present, when the contract with the mobile phone operator is canceled, the USIM / SIM is requested according to the user's request. The card can be owned by the user even after cancellation.

  Therefore, in practice, a user who owns a USIM / SIM card even after canceling the service can use only the additional functions by loading the USIM / SIM card into the mobile phone terminal. It was not enough as a countermeasure on the business side.

  In view of the above points, an object of the present invention is to make it possible to more reliably limit the use of additional functions of a mobile phone terminal after cancellation with a mobile phone operator.

In order to solve the above problems, in the present invention,
In a mobile phone terminal that can be used by being loaded with a module in which an identifier IMSI (International Mobile Subscriber Identity) fixedly assigned to a user is written,
A discriminating means for discriminating whether or not an operator code that matches the operator code of the identifier IMSI of the module is recorded in predetermined information of the module at the time of start-up;
Means for restricting the use of an additional function other than the communication function when the determination means determines that the operator code matching the operator code of the identifier IMSI is recorded in the predetermined information of the module; ,
A mobile phone terminal is provided.

  In particular, as the predetermined information of the module, for example, an FPLMN (Forbidden Public Land Mobile Network) may be used as described in claim 2.

  The module identifier IMSI includes the operator code of the mobile phone operator with whom the user has contracted. Canceling the contract does not delete this operator code in the module. On the other hand, when canceling the contract, the mobile phone operator can write his / her operator code in predetermined information of the module, for example, FPLMN.

  Alternatively, after the user cancels the contract, when the module is loaded into the mobile phone terminal and started up, the mobile phone terminal automatically issues an authentication request to the base station. By canceling the contract with the module's FPLMN by instructing the mobile phone terminal to write its own carrier code in the module's FPLMN from the base station of the mobile phone carrier whose license has been canceled It is possible to write the operator code of the mobile phone operator.

  According to the present invention configured as described above, when the mobile phone terminal is turned on and started up, the mobile phone terminal, for example, the identifier IMSI written in a module such as a USIM / SIM card, and the predetermined Information, for example, FPLMN is read out, and it is determined whether or not the operator code that matches the operator code of the identifier IMSI is recorded in the predetermined information.

  When the mobile phone terminal determines that the operator code that matches the operator code of the identifier IMSI is written in the predetermined information, the mobile phone terminal determines that the user has canceled the contract with the mobile phone operator. Limit the use of additional functions other than communication functions.

  According to the present invention, each time a mobile phone terminal is started up, the business operator code that matches the business operator code of the identifier IMSI written in the module loaded in the mobile phone device is the predetermined information of the module. Since it is possible to determine whether or not the user has canceled the contract with the mobile phone operator based on whether or not it is recorded in the information, use of additional functions other than the communication function can be surely restricted.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a mobile phone terminal and an additional function limiting method according to the present invention will be described below with reference to the drawings.

[Example of hardware configuration of mobile phone terminal]
As shown in FIG. 1, the mobile phone terminal 10 of this embodiment has a mobile phone function unit 2, an operation unit 3, a display unit 4, and a control unit 1 configured with a microcomputer. The TV reception function unit 5, the camera function unit 6, and the USIM / SIM card interface unit (in the figure, the interface unit is described as an I / F unit) 7 are connected to each other.

  The mobile phone function unit 2 includes a microphone for collecting voice for transmission and a speaker for reproducing received voice, and also includes a processing unit for transmission signals and reception signals, and performs control according to a user operation input through the operation unit 3. In accordance with control from the unit 1, telephone communication, mail communication, and Internet communication are executed.

  The operation unit 3 includes an on-hook key for communication, an off-hook key and a numeric keypad, a menu key, a cursor movement key, a function key, and the like. The display unit 4 is composed of, for example, an LCD (Liquid Crystal Display), and displays a received television broadcast screen, a captured still image and a moving image on the display screen, in addition to a standby display of a mobile phone and a telephone number display. The

  In this example, the television receiving function unit 5 is a function unit that receives so-called one-segment broadcasting of digital terrestrial television broadcasting, and is an additional function part. For example, when the user selects a television reception function from a function list menu, the television reception function unit 5 activates the function under the control of the control unit 1. The television broadcast signal received by the television reception function unit 5 is sent to the display unit 4 through the control unit 1 and displayed on the display screen.

  The camera function unit 6 is a part provided with a function that can capture and store still images and moving images. The camera function is also an additional function. When the user selects a camera function from, for example, a function list menu, the function is activated by control from the control unit 1.

  In this embodiment, as will be described later, the control unit 1 cancels the contract with the mobile phone carrier when the mobile phone terminal 10 is turned on, and the mobile phone terminal 10 uses the additional function. It is determined whether or not the use of the function is to be disallowed, and when it is determined that the use is to be disallowed, even if the user requests activation of the additional function, the additional function is Control not to start.

  In addition to these, the mobile phone terminal 10 includes, for example, a calculator function, a clock function, an alarm function, a schedule management function, and the like as additional functions, which are omitted in FIG. In this embodiment, among the above-described additional functions, when the user cancels the contract with the mobile phone operator, the range of the additional function that restricts the use is, for example, at the time of manufacture or by the operator. The additional function range that is set and restricted in use cannot be used by the user after canceling the contract. A mobile phone operator or a mobile phone terminal manufacturer can set which additional functions are restricted for use after the contract is canceled.

  For example, the TV reception function and camera function are included in the range of additional functions that are restricted from being used after the contract is canceled, and the user cannot use after the contract is canceled, while the calculator function, clock function, alarm function, etc. It can be excluded from the additional function range that is restricted in use, and can be used even after the contract is canceled.

  The USIM / SIM card interface unit 7 includes a loading unit for the USIM / SIM card 8. When the control unit 1 of the mobile phone terminal 10 confirms that the USIM / SIM card 8 is loaded in the own terminal through the USIM / SIM card interface unit 7, the control unit 1 can execute communication with the mobile phone terminal 10. To be in a state.

  The USIM / SIM card interface unit 7 reads the information written in the USIM / SIM card 8 and supplies the information to the control unit 1 for use in the various communications described above, or from the control unit 1 as necessary. The information according to the control is written into the USIM / SIM card 8.

  The USIM / SIM card 8 stores information such as contract conditions between the mobile phone operator and the user, a telephone book, and incidental information for communication in a file format. As one of the information, the USIM / SIM card 8 has a user identifier IMSI (International Mobile Subscriber Identity) fixedly assigned to the user. The identifier IMSI includes an operator code of a contracted mobile phone operator, identification information of a contract user, and the like.

  The mobile phone terminal 10 uses this identifier IMSI to perform authentication processing with the base station 11 in the radio wave receivable area AR as shown in FIG. Calling (outgoing) is possible.

  Also, the USIM / SIM card 8 defines and stores a file called FPLMN (Forbidden Public Land Mobile Network) as one of supplementary information files for communication.

  In this file FPLMN is written a carrier code of a mobile phone operator who refuses roaming (that a base station of a mobile phone carrier other than the contracted mobile phone carrier can be used).

  That is, in GSM / W-CDMA and the like, roaming is possible, but some mobile phone operators do not permit this roaming. When there is an authentication request from a mobile phone terminal that should not allow standby because roaming is not allowed, the base station of the mobile phone carrier that does not permit roaming, The user is instructed to write his / her company code in the file FPLMN of the USIM / SIM card 8 to reject the standby.

  On the other hand, when the mobile phone terminal that has made the authentication request receives the write instruction as described above from the base station, the mobile phone terminal writes the received carrier code in the file FPLMN of the USIM / SIM card 8. As a result, the mobile phone terminal is prevented from accessing again the base station of the mobile phone carrier in which the carrier code is written in the file FPLMN.

  A plurality of business operator codes can be written in the file FPLMN of the USIM / SIM card 8.

[Process to limit additional functions]
<Outline of processing on the mobile phone carrier or base station>
(1) When the mobile phone carrier can temporarily store the USIM / SIM card from the user when canceling the contract In this embodiment, when the user cancels the contract with the mobile phone carrier, the mobile phone carrier When the telephone carrier can temporarily store the USIM / SIM card from the user, the person in charge of the mobile telephone carrier uses the card writer to store the file FPLMN of the USIM / SIM card. Write your business code.

  In this way, the same carrier code as the carrier code written in the identifier IMSI is written in the file FPLMN in the USIM / SIM card. Thereby, in the mobile phone terminal, it is possible to detect that the contract between the mobile phone carrier of the carrier code written in the identifier IMSI and the user has been canceled.

(2) When the mobile phone carrier cannot keep the USIM / SIM card from the user when canceling the contract As described above, the user can own the USIM / SIM card even after canceling the contract. In many cases, the user does not bring a USIM / SIM card and cannot keep the USIM / SIM card even temporarily.

  In the conventional example, when a user who has canceled a telephone communication contract attempts to use a mobile phone terminal by loading the USIM / SIM card to be canceled into the mobile phone terminal, the base station When the identifier IMSI included in the authentication request from the client is analyzed and it is detected that the user has been canceled from the telephone communication contract, the authentication is rejected so that standby reception and transmission are not accepted.

  Therefore, as it is, a mobile phone terminal loaded with a USIM / SIM card subject to contract cancellation cannot perform telephone communication, but additional functions such as a TV broadcast reception function and a camera function are usable.

  Therefore, in this embodiment, when the base station of the mobile phone carrier analyzes the identifier IMSI included in the authentication request from the mobile phone terminal and detects that the user has been canceled from the telephone communication contract, In addition to not accepting standby reception and outgoing calls, as well as non-permitted roaming, the mobile phone terminal that requested authentication is given its business code as a file on the USIM / SIM card. It is configured to send an instruction to write to the FPLMN.

  Then, in the mobile phone terminal that has received the instruction from the base station, the received operator code is written in the file FPLMN of the USIM / SIM card in the same manner as when the roaming non-permission notice is received from the base station. Like that.

  Thus, the same operator code as the operator code written in the identifier IMSI is written in the file FPLMN in the USIM / SIM card. Thereby, in the mobile phone terminal, it is possible to detect that the contract between the mobile phone carrier of the carrier code written in the identifier IMSI and the user has been canceled.

<Processing on the mobile phone terminal>
When the USIM / SIM card 8 is not loaded in the mobile phone terminal 10 of this embodiment, all the functions including not only the telephone communication function but also the additional function are disabled. Then, when the USIM / SIM card 8 is loaded, the power is turned on, and the mobile phone terminal 10 is started up, the mobile phone terminal 10 is not out of service area (cannot receive radio waves from the base station), An authentication request is transmitted to the base station in the radio wave receivable area AR, and if the authentication is successful, the telephone standby reception is started.

  When the mobile phone terminal 10 is started up, the mobile phone terminal 10 further reads the identifier IMSI from the USIM / SIM card 8 and also reads the file FPLMN, and the carrier code that matches the carrier code in the identifier IMSI in the file FPLMN. It is determined whether or not exists.

  When it is determined that the operator code matching the operator code of the identifier IMSI is written in the file FPLMN, the control unit 1 of the mobile phone terminal 10 communicates with the mobile phone operator of the operator code. In this embodiment, it is determined that the contract has been canceled, and the use of a specific additional function is disabled in this embodiment.

  At this time, the control unit 1 of the mobile phone terminal 10 does not access the base station of the business operator having the business operator code written in the file FPLMN. An authentication request is not issued to the base station, and therefore the telephone communication function is disabled.

<Details of processing on mobile phone terminals and base stations>
The processing performed by the mobile phone terminal 10 and the base station 11 to limit the additional functions described above will be described with reference to a flowchart.

  FIG. 3 is a flowchart for explaining start-up processing when the mobile phone terminal 10 is powered on. Each step of the flowchart of FIG. 3 is executed by the microcomputer of the control unit 1 of the mobile phone terminal 10 as a software process.

  The control unit 1 determines whether the power is turned on through the operation unit 3, determines whether the power is turned on and the mobile phone terminal 10 is started up (step S101), and the power is turned on. If it is determined that there is not, it waits until the power is turned on.

  When it is determined in step S101 that the power is turned on and the mobile phone terminal 10 is started up, the control unit 1 determines whether the USIM / SIM card 8 is loaded in the mobile phone terminal 10 (step S101). S102), for example, a message such as “cannot be used because no card is inserted” is notified to the user that the card cannot be used (step S103). Then, this startup process is terminated.

  When it is determined in step S102 that the USIM / SIM card 8 is loaded in the mobile phone terminal 10, the control unit 1 executes a terminal initial setting process (step S104). This terminal initial setting process includes a process of turning off a function restriction flag used to limit the usable range of the additional function. Here, the reason why the function restriction flag is turned off is that if the USIM / SIM card 8 changes, the function restriction in the mobile phone terminal 10 main body may change.

  After step S104, the control unit 1 sends an authentication request for telephone communication to the base station 11 and performs an authentication process (step S105). The details of the authentication request process performed by the mobile phone terminal 10 are as shown in the flowchart of FIG. Further, the process of the base station 11 in response to the authentication request from the mobile phone terminal 10 is shown in the flowchart of FIG.

  That is, the control unit 1 of the mobile phone terminal 10 sends an authentication request to the base station 11 in the radio wave receivable area AR (step S111 in FIG. 4). This authentication request includes the identifier IMSI written in the USIM / SIM card 8.

  Upon receiving this authentication request (step S121 in FIG. 5), the base station 11 checks the operator code in the identifier IMSI included in the received authentication request, and the contract with the mobile phone operator continues effectively. Whether or not the service has been canceled (step S122). When the base station 11 determines that the contract has not been terminated, the base station 11 sends authentication OK to the mobile phone terminal 10 that has requested authentication (step S124), and starts a standby process (step S125).

  When it is determined in step S123 that the contract has been canceled, the base station 11 writes its own business code (the same business code as the business code in the received identifier IMSI) to the USIM / SIM card. Is sent to the mobile phone terminal 10 that has requested authentication (step S126). Then, the mobile phone terminal 10 that has requested authentication is notified that the standby is rejected (step S127).

  FIG. 5 shows the processing for the authentication request in the case of the base station of the mobile phone operator contracted by the user. However, if the base station is a base station other than the mobile phone operator contracted by the user. The base station determines whether or not to allow roaming, and if roaming is permitted, performs a standby process as authentication OK. If roaming is not permitted, the base station performs its own operator code. Is sent to the mobile phone terminal 10 that has requested the authentication.

  The control unit 1 of the mobile phone terminal 10 receives the transmission information from the base station 11 in response to the authentication request in step S111, and determines whether or not an operator code write request instruction has been received (step S112 in FIG. 4).

  When it is determined in step S112 that the authentication OK is received instead of the operator code write request instruction, the control unit 1 starts standby reception for the base station 11 (step S113). Then, the process returns to the main routine of FIG.

  When it is determined in step S112 that the business code write request instruction has been received, the control unit 1 uses the received business code as the file FPLMN of the USIM / SIM card 8 loaded in the mobile phone terminal 10. (Step S114). Then, upon reception of standby rejection, standby reception for the base station 11 is stopped (step S115). Then, the process returns to the main routine of FIG.

  When the above authentication process is completed, the control unit 1 reads the business code of the file FPLMN of the USIM / SIM card 8 and the business code of the identifier IMSI (step S106 in FIG. 3).

  Next, the control unit 1 determines whether or not the provider code of the file FPLMN matches the provider code of the identifier IMSI (step S107). When it is determined in step S107 that the business code of the file FPLMN matches the business code of the identifier IMSI, the control unit 1 determines that the contract has been canceled and restricts use when the contract is canceled. The function restriction flag for the additional function within the set range is turned on to limit the use range of the additional function (step S108). That is, as described above, the additional function within the range set to restrict the use when the contract is canceled cannot be used.

  Then, this startup process is terminated. At this time, since standby reception is stopped in step S115 of FIG. 4, not only the additional function but also the function as a mobile phone terminal is limited.

  If it is determined in step S107 that the business code of the file FPLMN does not match the business code of the identifier IMSI, the control unit 1 leaves the function restriction flag off and ends this startup process. At this time, standby reception is started in step S113 in FIG. 4, and the operation of the normal mobile phone terminal 10 in which all the additional functions can be used is performed.

[Process when user activates additional function]
Next, an example of the control processing operation of the control unit 1 when the user performs an activation operation of the additional function in the mobile phone terminal 10 is shown in the flowchart of FIG.

  That is, when the user activates the additional function, for example, by operating a menu or a predetermined key, the flowchart of FIG. 6 is started. First, the control unit 1 checks the additional function usable range (step S131), and determines whether or not the function restriction flag for the activated additional function is on (step S132).

  If it is determined in step S132 that the function restriction flag for the activated additional function is not on but off, the control unit 1 determines that the activated additional function is permitted to be used, and The additional function is activated and executed (step S133).

  If it is determined in step S132 that the function restriction flag for the activated additional function is ON, the control unit 1 notifies the user that the additional function requested to be activated cannot be used (step S134). Without activating the additional function (step S135), this processing routine is terminated.

  Note that the notification in step S134 is made, for example, by displaying a message indicating that the additional function cannot be used on the display screen of the display unit 4, or generating a warning sound indicating that the additional function cannot be used.

  As described above, according to this embodiment, in the mobile phone terminal using the USIM / SIM card, after the user cancels the contract with the mobile phone operator, the use of the additional function of the mobile phone terminal is ensured. Can be limited.

  As described above, the additional functions that cannot be used may be all of the additional functions of the mobile phone terminal. As described above, the manufacturer of the mobile phone terminal or the mobile phone operator cancels the contract. A range of additional functions that cannot be used later may be set.

[Other Embodiments and Modifications]
In FIG. 3, after executing the terminal initial setting process in step S104, the authentication process for telephone communication is executed. However, if this authentication process is not possible, for example, if it is out of service area, The processing after S106 is executed.

  Further, when the above-described authentication request is made from the mobile phone terminal, the same operator code as the operator code written in the identifier IMSI is still written in the file FPLMN of the USIM / SIM card. If the base station requested for authentication is a base station of an operator other than the operator whose contract has been canceled and does not refuse roaming, the additional function can be used. After that, when authentication processing is performed between the base station of the business operator whose contract has been canceled and the mobile phone terminal, the business operator code written in the identifier IMSI is stored in the file FPLMN of the USIM / SIM card. Since the same operator code is written, there is no problem.

  In the above-described embodiment, it is determined whether or not the contract has been canceled based on whether or not the operator code that matches the operator code in the identifier IMSI is written in the file FPLMN of the USIM / SIM card. However, it is determined whether or not the contract has been canceled depending on whether or not the operator code that matches the operator code in the identifier IMSI is written in another appropriate file of the USIM / SIM card. You can also

  For example, in the USIM / SIM card, there is an “other file” that can be individually used by the mobile phone operator, and an operator code that matches the operator code in the identifier IMSI is written in this “other file”. It can also be determined whether or not the contract has been canceled based on whether or not the contract has been made.

It is a block diagram which shows the structural example of embodiment of the mobile telephone terminal by this invention. It is a figure used in order to demonstrate embodiment of the additional function limiting method of the mobile telephone terminal by this invention. It is a figure which shows the flowchart for demonstrating the processing operation at the time of starting in embodiment of the mobile telephone terminal by this invention. It is a figure which shows the flowchart for demonstrating the process operation of standby in embodiment of the mobile telephone terminal by this invention. FIG. 5 is a flowchart for explaining the processing operation on the base station side corresponding to the standby processing operation of the embodiment of the mobile phone terminal of FIG. 4. It is a figure which shows the flowchart for demonstrating the processing operation at the time of starting operation of the additional function in embodiment of the mobile telephone terminal by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Control part, 2 ... Cell-phone function part, 3 ... Operation part, 5 ... Television reception function part, 6 ... Camera function part, 8 ... USIM / SIM card

Claims (5)

In a mobile phone terminal that can be used by being loaded with a module in which an identifier IMSI (International Mobile Subscriber Identity) fixedly assigned to a user is written,
A discriminating means for discriminating whether or not an operator code that matches the operator code of the identifier IMSI of the module is recorded in predetermined information of the module at the time of start-up;
Means for restricting the use of an additional function other than the communication function when the determination means determines that the operator code matching the operator code of the identifier IMSI is recorded in the predetermined information of the module; ,
A mobile phone terminal comprising: The mobile phone terminal according to claim 1,
The mobile phone terminal characterized in that the predetermined information of the module is FPLMN (Forbidden Public Land Mobile Network). When a mobile phone terminal that can be used by being loaded with a module in which an identifier IMSI (International Mobile Subscriber Identity) that is fixedly assigned to a user is loaded, the identifier of the module is set when the terminal starts up. A discriminating step for discriminating whether or not an operator code that matches an IMSI operator code is recorded in the predetermined information of the module;
When the mobile phone terminal determines in the determining step that the operator code that matches the operator code of the identifier IMSI is recorded in the predetermined information of the module, an additional function other than the communication function The process of restricting the use of
A method for restricting additional functions of a mobile phone terminal comprising: A step in which a mobile phone terminal that can be used by loading a module in which an identifier IMSI (International Mobile Subscriber Identity) fixedly assigned to a user is written makes an authentication request to the base station;
When the base station detects that the mobile phone terminal has been canceled in response to the authentication request from the mobile phone terminal, the same base code as the carrier code defined in the identifier IMSI is set. Transmitting from the base station to the mobile phone terminal;
A determining step of determining whether or not an operator code that matches the operator code of the identifier IMSI of the module is recorded in the predetermined information of the module when the mobile phone terminal is started up. When,
When the mobile phone terminal determines in the determining step that the operator code that matches the operator code of the identifier IMSI is recorded in the predetermined information of the module, an additional function other than the communication function The process of restricting the use of
A method for restricting additional functions of a mobile phone terminal comprising: In the method for restricting an additional function of the mobile phone terminal according to claim 3 or 4,
The predetermined function information of the module is FPLMN (Forbidden Public Land Mobile Network).

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