MXPA99011913A - Roaming method and devices appropriate therefor - Google Patents

Abstract

The invention relates to a telecommunications method which enables a visited mobile radio telephone network (VPLMN, VPLMN') to be connected to a subscriber of a home mobile telephone network (HPLMN) without roaming agreements with the home mobile radio telephone network (HPLMN). To this end, a first IMSI number (IMSI1) from a number range of the subscriber's home mobile telephone network (HPLMN) and a second IMSI number (IMSI2) from the number range of a partner network (PPLMN) are assigned to the subscriber. The partner network (PPLMN) can be used via additional roaming agreements, and a common subscriber's number (MSISDN) is assigned to both aforementioned IMSI numbers (IMSI1, IMSI2). Both IMSI numbers (IMSI1, IMSI2) can preferably be stored on a common identification module or on different identification modules.

Description

ITINERANT SERVICE PROCEDURE AND CORRESPONDING DEVICES DESCRIPTIVE MEMORY The present invention relates to a roaming service procedure and corresponding devices. The invention relates in particular to a roaming service procedure and corresponding devices, which are based on the GSM specifications and which are a further development of the International roaming service. An itinerant service means the service of a GSM terminal unit outside the local network. However, the invention can also be used for the problem of the roaming service between different GSM and / or non-GSM networks, for example for the roaming service between networks working according to several standards such as GSM, UMTS, Intelligent Netwo (IN), etc. With a so-called "indirect roaming service", an impeller of a mobile radiotelephone network, ie a mobile impeller, can offer its mobile subscribers a supply with surface coverage, without having to organize the entire radiotelephone network in its concessioned territory. In addition, rapid access to the global roaming service may be possible through the "indirect roaming service".

Patent document WO98 / 10614, the content of which is hereby incorporated by reference, describes a method for an "indirect roaming service", which makes it possible for a subscriber of a mobile radio network (Home Public Land Mobile Network, HPLMN) to connect to a visited mobile radio network (Visited Public Land Mobile Network, VPLMN) without a mobile service contract with the local mobile radiotelephone network (HPLMN), where the connection takes place via means, for example an IMSI number ( IMSI = International Mobile Subscriber Identity) and an MSISDN number (MSISDN = Mobile Subscriber Integrated Sevices Digital Network), which is made available to a partner network (Partner Public Land Mobile Network, PPLMN), which has a mobile service contract on the one hand with the local mobile radio network (HPLMN) and on the other hand with the visited network of mobile radiotelephony (VPLMN). In the procedure described in WO98 / 10614, each SIM card (SIM = Subscriber Identity Module) of the HPLMN subscriber contains two IMSI numbers. Each IMSI number is assigned a different call number (MSISDN). The first IMSI number belongs to the range of numbers of the local network of mobile radiotelephony HTLMN, the second to the range of numbers of the partner network PPLMN. To subscribe to a visited network (VPLMN-NR, NR = no roaming service), which has no roaming service contract with the HPLMN, the subscriber can exchange the first IMSI (of HPLMN) for the second IMSI (of PPLMN) and it is considered as such in the visited network (VPLMN) as a subscriber of the partner network (PPLMN). Since in the method described in WO98 / 10614, each IMSI is assigned another different MSISDN, calls with the first MSISDN for the subscriber must be diverted with an expensive mechanism, in a so-called UBICOM rotating plate. The other subscriber-specific data, for example call deviations, additional numbers, etc., are also very conventionally subordinated to the IMSI and therefore available only in the local mobile radio network (HPLMN) or in the visited networks of mobile radiotelephony ( VPLMN-WR, WR = with roaming service) with an itinerant service contract with the HPLMN. An object of the invention is therefore to provide a method and a system that avoids these disadvantages. In accordance with the present invention, this object is achieved in particular by the elements of the independent claims. Other advantageous embodiments result in addition to the dependent claims and the description. This goal is achieved in particular by the invention, by the method according to the invention, which makes it possible for a subscriber of a local mobile radio network (Home Public Land Mobile Network, HPLMN), to connect to a visited network of mobile radiotelephony (Visited Public Land Mobile Network, VPLMN) ) without a mobile service contract with the local mobile radiotelephone network (HPLMN), while the subscriber acquires an identification module with a first mobile subscriber identification (International Mobile Subscriber Identity, IMSI) from the range of numbers in its local network of mobile radiotelephony (HPLMN) and with a second mobile subscriber identification (IMSI) of the range of numbers of a partner network (Partner Public Land Mobile Network, PPLMN), partner network (PPLMN) that has additional roaming service contracts, the two so-called mobile subscriber IDs (IMSI) are assigned a common call number (Mobile Subscriber Integrated Services Digital Network, MS ISDN). The assignment of a common call number (MSISDN) to the different mobile subscriber identifications (IMSI) has in particular the advantage that can be found to a subscriber through this unique call number (MSISDN), even if it is registered with different subscribers. mobile subscriber identifications (IMSI) in your local mobile radiotelephone network (HPLMN), respectively in a visited mobile radio network (VPLMN). The assignment of two (or more) mobile subscriber identifications (IMSI) to a subscriber, one of the range of numbers of the local mobile radiotelephone network (HPLMN) and one of the number range of a partner network (PPLMN), it also has the advantage that the subscriber is not only assigned to the roaming service contract of the partner network driver (PPLMN), but can additionally also benefit from roaming service contracts eventually agreed to later by his local network driver. As already mentioned at the beginning, the invention relates to mobile networks according to the GSM standard, but it can also be extended in other mobile networks, for example in UMTS mobile networks (UMTS = Universal Mobile radiotelephone System) or in particular also for the roaming service between several GSM and / or non-GSM networks. In a preferred application variant, the identification module activates the second mobile subscriber identification (IMSI) of the number range of a partner network (PPLMN), when it can not be registered with the first mobile subscriber identification (IMSI) of the range of numbers of your local mobile radiotelephone network (HPLMN) in a network. The activation of an alternative mobile subscriber identification (IMSI) can be carried out in different modal variants, which can be carried out as common variants depending on the situation or separated, automatically or through the subscriber, for example by means of input means. your terminal unit. In different application variants, the first mobile subscriber identification ((IMSI) - of the range of numbers of the mobile wireless local network (HPLMN) - in the local register (Home Location Register, HLR) is stored (subvariant a1). of this mobile radiotelephone local network and the code of the second mobile subscriber identification (IMSI) -from the range of numbers of the partner network (PPLMN) - of the first mobile subscriber identification (IMSI) or are stored both in the first as the second mobile subscriber identification (IMSI) in the local registry (HLR) of the local mobile radio network (HPLMN) and chained with a single number of calls (MSISDN), preferably only a subscriber identification Mobile (IMSI) is active at all times Preferably, common accounts are prepared to the respective subscriber by at least some of the two mobile subscriber identifications (IMSI) chained together n a same call number (MSISDN), while a common account is made to the respective subscriber for at least some other at least of the two mobile subscriber identifications (IMSI) chained with the same call number (MSISDN). This specific settlement in terms of situation has the advantage that it is very flexible and that correspondingly after the application, and not only in relation to the "direct itinerant service", separate accounts can be prepared to a subscriber for different usage objectives, with which the corresponding mobile subscriber identification (IMSI) corresponding to the objective and settlement is activated accordingly. for example different mobile subscriber identifications (IMSI) for service and private use. The object of the invention is achieved in particular also because an identification module according to the invention, which is intended for the use of a mobile radiotelephone and makes possible the storage of at least two identifications of the mobile subscriber (IMSI), contains at least a first mobile subscriber identification (IMSI) of the range of numbers of a local mobile radio network (HPLMN) and a second mobile subscriber identification (IMSI) of the range of numbers of a partner network (PPLMN), whereby both mobile subscriber identifications (IMSI) are linked with a common call number (MSISDN). The object of the invention is achieved in particular also because a programmable device according to the invention with a local register (HLR), in which for each subscriber of a local mobile radiotelephone network (HPLMN) contains at least one identification of mobile subscriber (IMSI) and at least one corresponding call number (MSISD), this local data register (HLR) at least for certain subscribers contains a first mobile subscriber identification (IMSI) of the range of numbers of its network mobile radiotelephone location (HPLMN), a second mobile subscriber identification (IMSI) of the number range of a partner network (PPLMN) and a call number (MSISDN) assigned in common to these two mobile subscriber identifications (IMSI) . An application of the present invention is described below based on an example. The example of the application is illustrated by means of the following appended figures: Figure 1 shows an assembly diagram which schematically represents the signaling relations in the register according to variant a1), variant in which an identification is registered Mobile Subscriber (IMSI) chained with a call number (MSISDN) in the local registry (HLR). Figure 2 shows an assembly diagram which schematically represents the signaling relations in the register according to variant a2), variant in which two mobile subscriber identifications (IMSI) chained to a call number (MSISDN) are registered. common in the local registry (HLR). Figure 3 shows an overall diagram which schematically represents the signaling relations in a communication that establishes deadlines according to variant a1), a variant in which a mobile subscriber identification (IMSI) chained to a call number is registered. (MSISDN) in the local registry (HLR). Figure 4 shows an assembly diagram which schematically represents the signaling relations in a communication that establishes deadlines according to variant a2), variant in which two mobile subscriber identifications (I MSI) are linked with a number of call (MSISDN) common in the local registry (HLR). In accordance with the present invention, a leased impeller of a local mobile network (hereinafter referred to as a leased impeller) establishes and powers one or more mobile switching centers in its local mobile radio network HPLMN (see Figures 1 to 4) / local location registers (MSC / HLR) and a local mobile radio network, for example a mobile radiotelephone network, based on the GSM standard, or UMTS or some other mobile network, according to your economic considerations (eventually only in conurbated areas). The licensed driver of the local territory of mobile radiotelephone HPLMN enables its customers (subscribers) the service of mobile terminal units 1 in mobile radiotelephone networks VPLMN, VPLMN 'visited outside the network itself through the function of the indirect roaming system system. For this purpose, a partner promoter of a PPLMN partner network makes its roaming service relations available to the licensed driver. In the international roaming service, the mobile subscriber identification according to the GSM specifications is based on the number of ÍMSI (IMSI = International Mobile Subscriber Identity). The partner impeller makes available to the impeller therefore a range of IMSI numbers from the range of numbers of the partner impeller. The following two variants are described first: Variant a): An identification mode, for example a SIM card (Subscriber Identification Module), which is removably connected to a mobile terminal unit 1, contains two IMSI numbers, the first IMSI number IMSI1 of the range of numbers of the awarded impeller, the second IMSI number 1MSI2 of the number range of the partner impeller. Both IMSI numbers IMS1, IMSI2 are assigned a common call number MSISDN (number of MSISDN, integrated services digital network number to mobile subscribers). All subscriber-specific data, such as call switching, additional numbers for fax and data transfer, etc., are assigned to the MSISDN call number and are therefore always arranged independently of the used IMSI IMSI1, IMSI2 numbers correspondingly in the network. The advantage of this preferred variant a) lies in that subscribers are also assigned IMSI numbers IMSI1 of the HPLMN network of the leased impeller. In that way, a licensed driver can form its own roaming service partner relationships. In addition, the SIM cards must be exchanged in a cancellation eventually following the roaming service endirect.

Variant b): The SIM card contains only one IMSI IMSI2 number. This derives from the range of IMSI numbers of the partner driver. This IMSI IMSI2 number is assigned an MSISDN call number from the number range of the allocated impeller. The advantage of this variant b) is that it is a simpler solution, in relation to the SIM card, the mobile terminal unit 1 and the network. Variant b), however, has great disadvantages, especially with respect to the possibilities of the further development of the granted impeller, in particular because, parallel to the indirect roaming service, it is not possible in the formation of direct roaming service relations. In addition, SIM cards must be exchanged in an indirect roaming service cancellation. Accordingly, this variant b) will no longer be described in more detail below. The mobile subscribers of the HPLMN mobile radiotelephone local territory are preferably registered in one or more local registers HLR (local location register) of the licensed driver, which is also responsible for the administration of the clients. For the preferred variant a), the following sub-variants are described for handling the two IMSI numbers IMSI1, 1 MSI2: Subvariant a1) (see photo 1): In the local register HLR of the driven impeller, only the IMSI IMSI1 number of the concentrated impeller is recorded. The corresponding IMSI number IMSI2 of the partner driver of the partner network PPLMN differs from the IMSI number IMSI1 of the granted driver only in the mobile country code (MCC), in the mobile network code (MNC) and by the need of two (h? h2) or other additional digits of the mobile subscriber identification number (MSIN), as represented in the following example: EXAMPLE In the SS7-MAP messages (SS7 = signaling systems No. 7, MAP = mobile application part), which are transmitted between the partner impeller and the concentrated impeller, the code (IMSI2 from the partner impeller to the impeller IMSI1) is converted concession and vice versa) of the IMSI number IMSI1, IMSI2 correspondingly in block 3 (see Figure 1, respectively Figure 3). Block 3 is for example a programmed software module, which is installed and performed, for example, on the same computer as the local HLR register of the licensed impeller or on any other suitable network element. The signaling communication between the partner network PPLMN and the local network of mobile radio telephone HPLMN, respectively between the partner network PPLMN and the partner network of roaming service VPLMN, is shown schematically in figure 1 with double arrows drawn. In accordance with the GSM standard, a SIM card is authenticated for security reasons for the description in the network. Authentication refers to the IMSI number. Since only the number of IMSl and IMSI1 of the authorized driver in the local register HLR is registered in the subvariant 1), only one authenticity (key Ki) for the two numbers IMSI, IMSI1, IMSI2 prevails. Accordingly, the SIM card in the mobile radiotelephone 1 must also be programmed with a single authenticity (key Ki) for both numbers IMSI, IMSI1, IMSI2.

Subvariant a2) (see figure 2) In the local register HLR of the leased impeller, both numbers of IMSI, IMSI1, IMSI2 and chained with a common MSISDN call number are registered. Only one of the two numbers IMSI, IMSI1, IMSI2 is correspondingly active (which is indicated in Figure 2, respectively in Figure 4, by the block plotted around IMSI2), depending on which network the client has enrolled in lately. . The local register HLR contains for example a list of identifications of mobile subscribers (IMSI numbers), which also includes for each mobile subscriber identification (IMSI number) and IMSI1, IMSI2 an active flag, which can be set as such. so that at the same time correspondingly it is valid as activates a mobile subscriber identification IMSI1, IMSI2. For the expert, there are different methods to mark as active a mobile subscriber designation IMSI1, IMSI2 in the corresponding list of the local register HLR; this can be done for example during the location update, which is done in accordance with the GSM standard, when a suitable subscriber with his mobile terminal 1 is enrolled in a visitor location register MSC / VLR. Both IMSI numbers IMS11, IMSI2, however, also have individual authentications (key Ki), whereby subvariant a2) also differs on the SIM card side of subvariant a1). At this point it is also necessary to mention that the subvariant a2) can also be used for other applications, for example for two SIM cards with a common MSISDN call number or for two IMSI numbers IMSI1, IMSI2 in a single SIM card. SIM to differentiate the different application objectives, such as private and commercial calls. For example, a separate account can be set up for the settlement of outgoing calls (originating calis) of a settlement center of one correspondingly exposed according to the application for any or at least for some mobile subscriber identification IMSI1, IMSI2, chained to the same MSISDN number, or to establish a common account for all or at least some of the mobile subscriber identifications IMSI1, IMSI2, with the same MSISDN number. The calculation center correspondingly assigns several calculation addresses to all or at least some mobile subscriber identifications IMSI1, IMSI2, respectively assign a common calculation address of the call number MSISDN or at least of some identifications of mobile subscriber IMSI1 , IMSI2. For the calculation of costs, for example, as usual, the corresponding call data records can be used.

In all the variants mentioned above a1), a2) and b), the local register HLR is, as already indicated, preferably in the network of the granted impeller. According to the GSM specifications, the address of the local register HLR, ie the address of HLR, is derived for sending SS7 messages to the local register HLR among others of the IMSI number (the code of the CCITT number format is converted E.212 to CCITT E.214). Since the messages that are verified from the visited networks VPLMN, VPLMN 'in the partner network PPLMN contain an address of the partner network PPLMN, the code must be converted into the message addresses, ie the global title in the Part of Control of Signaling Connections (SCCP) or transmit messages without SCCP route assignment in the public network, for example through leased lines or through the Internet, to the local territory of the HPLMN mobile radiotelephone of the licensed driver. In messages that are sent from the local HLR registry to the visitor location register (VLR) MSC / VLR, an HLR address of the range of numbers of the PPLMN partner network must be contained as a sender, to guarantee the sending of messages. The translation of the global title (Global Title) SCCP is carried out, as illustrated in FIGS. 1 to 4, in block 2, whereby block 2 is for example a programmed software module, which is installed and performed for example on the same computer as the local registry (Home Location Register) of the PPLMN partner network or the mobile computing center / visitor location register MSC / VLR of the PPLMN partner network or in any other network element assigned for this purpose. Since the SS7 messages for the registration of the visited networks VPLMN, VPLMN 'are conducted through the partner network PPLMN in the HLR register of the licensed driver (Location Update), the partner driver has the possibility to control the number ranges of IMSI used by the licensed driver for the indirect roaming service. In variant a) (with subvariant a1) and a2)), which work with two numbers of IMSI IMSI1, IMSI2, registration takes place (Location Update) depending on the place of stay. As long as the respective mobile subscriber remains in the provided territory of the licensed impeller, i.e. in the local territory of the mobile radiotelephony HPLMN or in a visited network PPLMN with a direct roaming service contract with the impeller of the local mobile radiotelephone network HPLMN, register the mobile radiotelephone 1 automatically with the IMSI number of the number range of the impeller granted in this network, as illustrated in figures 1 and 2 with the arrows 10, respectively 11. This method corresponds to the standardized GSM procedures . If the mobile subscriber of the licensed impeller leaves the HPLMN supply territory itself, then the subscriber with the IMSI IMSI2 partner can be written automatically or manually to a visited VPLMN network of an impeller, which has a roaming service contract with the impeller partner, as this is illustrated in figures 1 and 2 with the arrows 20. According to the desired convenience for the subscriber, for example according to whether the change of IMSI is done manually or automatically, special functions can be carried out for this purpose on the SIM card or possibly also in mobile radiotelephones 1. Preferably, the IMSI change takes place by means of a programmed software function, without having to remove or manipulate for example a SIM card of the mobile radiotelephone 1. preference, the software function operates on the SIM card. However, it is also possible to choose a programmed function of software in the infrastructure of the network. In this case mentioned last, the first or second IMSI and IMSI1, IMSI2 number is activated by means of special messages, which are transmitted to the respective mobile radiotelephone 1, for example by means of SMS messages (SMS = Short Message Services = Short Message Services) or (USSD = Unstructured Supplementary Services Data), the infrastructure of the network. The incoming calls are sent by defined routes based on the MSISDN call number, which is in the range of numbers of the granted driver, to the network of the granted driver. Since the registration address of visitor locations (VLR) MSC / VLR, to which the subscriber has registered, is registered in the local registry HLR of the licensed driver, the functional development (requirement of the roaming service number and establishment of link with the roaming service number) takes place primarily in accordance with GSM specifications. In Figures 3 and 4, the signaling relations are for a communication that sets terms for a radiotelephone 1, ie for a call that enters a radiotelephone 1 for subvariant a1), respectively for subvariant a2) to those presented correspondingly in a schematic way. As an example, the incoming call is illustrated in Figures 3 and 4 with the arrow 4, which arrives through a mobile switching center GMSC input to the local radiotelephony network HPLMN. In figures 3 and 4, the double arrows drawn schematically illustrate the signaling for the request of a Roaming Number Request, while the completely drawn arrows represent in a simplified way the establishment of the link with the number obtained from the roaming service, since according to In this case, routes can also be linked through other networks. In the SS7-MAP messages, which are sent for the roaming service number request for the corresponding visitor location register MSC / VLR, it must nevertheless be as sender an HLR address from the range of numbers of the partner impeller and The IMSI number of the partner driver must be contained in the MAP message. Figures 3 and 4 further illustrate how the respective receiver is registered, while the inscription described above according to figures 1 and 2, with its mobile radiotelephone 1 in the partner network PPLMN with the number of IMSI and IMSI1 of the range of awarded driver numbers, respectively in the visited networks N, N 1 ', with the MSI number and MSI2 of the number range of the partner driver in the corresponding visitor location register MSC / VLR. Some itinerant service partners also request a fee for communications that set deadlines. The account statements take place through the settlement of data balances and liquidation of itinerant service balances of the partner driver, in the same way as described below for outbound communications. Exit calls are handled as "itinerant service cases" of the partner driver, ie. - Call conformation according to the GSM specification. - State of account through the settlement of data balances and itinerant service finances of the partner promoter. - The payment on account and the settlement of data balances of these links to the concessioned promoter takes place with a separate balance settlement through the partner promoter. Short messages are sent, which establish deadlines, in accordance with GSM specifications based on the address registered in the local HLR registry of the corresponding visitor location register, ie the VLR address and the IMSI number. . The SS7 message sent to the visitor location register MSC / VLR must contain as sender an IMSI and IMSI2 number from the number range of the partner impeller and in the MAP message the IMSI and IMS2 number of the partner impeller must be contained. Short messages are sent according to the GSM specifications to the Short Message Service Center (SMSC) of the licensed driver and / or to other SMSC's. In countries, respectively in supplied territories, in which the licensed driver has a direct intermittent service contract with other mobile drivers (Local Territory of Mobile Radiotelephony HPLMN or Red Socia PPLMN, respectively Visited Network with Traveling Service Contract), the itinerant service works with numbers of IMSI and IMSI1 of the range of numbers of the impeller granted according to the GSM specifications. In countries, respectively in supplied territories, in which there is no visited N network, N 'has a direct roaming service contract with the HPLMN local network, the subscriber can register with the IMSI of IMSI2 partner automatically or manually in a network of roaming service N, or N 'of the partner. The account status of these roaming service links takes place through the settlement of the data balance and the settlement of the itinerant service balance of the partner promoter with the corresponding credit to the licensed driver through the settlement of balances. of data LEGEND OF THE REFERENCE NOTATIONS 1 Mobile radiotelephone. 2 Translation of the global title (Global Title) SS7 SCCP. 3 Conversion of the IMSI code from the leased impeller (IMSI1) to the IMSI of the partner impeller (IMSI2) and vice versa. 4 Call with Number of Digital Network of Services Integrated to Mobile Subscribers (MSISDN) of the range of numbers of the granted driver. 10 Registration with IMSI of the awarded driver (IMSI1). 11 Registration with IMSI of the licensed impeller (IMSI1) conventional international roaming service. 20 Registration with the IMSI of the partner promoter (IMSI2). GMSC Mobile Entry Switching Center. HLR Local Registration (Home Location Register) HPLMN Local territory of mobile radiotelephony of the licensed impeller or of the network of the licensed impeller (Home Public Land Mobile Network). IMSI1 International Mobile Subscriber Identification Number of the number range of the licensed impeller. IMSI2 International Mobile Subscriber Identification Number of the number range of the partner driver. MSC / VLR Mobile Switching Center / Visitor Locations Records. MSISDN Number of Digital Network of Services Integrated to Subscribers Impulse mobiles awarded. PPLMN Partner network (provider of "indirect roaming service") (Partner Public Land Mobile Network). VPLMN Visited network of a partner service partner roving service partner (worldwide) (Visited Public Land Network). VPLMN 'Visited Public visited network in the country of the licensed driver Land Mobile Network).

Claims (14)

NOVELTY OF THE INVENTION CLAIMS

1. - Telecommunication procedure that allows a subscriber of a local radiotelephone network (HPLMN) to connect to a radiotelephone network (VPLMN, VPLMN ') visited without a roaming service contract with the local radiotelephone network (HPLMN), while assign a subscriber a first mobile subscriber identification (IMSI1) of the range of numbers of their local radiotelephone network (HPLMN) and a second mobile subscriber identification (IMSI2) of the range of numbers of a partner network (PPLMN), whereby the partner network has additional roaming service contracts, characterized in that the two mobile subscriber identifications (IMSI1, IMSI2) mentioned are assigned a common call number (MSISDN).

2. Telecommunication procedure according to the preceding claim, further characterized in that at least some of the aforementioned first and second mobile subscriber identifications (IMSI1, 1MSI2) chained with a common call number (MSISDN) are stored in a module of common identification.

3. Telecommunication procedure according to the preceding claim, further characterized in that said identification module activates the second mobile subscriber identification (IMSI2), when it can not be enrolled in a network with the first mobile subscriber identification (IMSI1) mentioned.

4. Telecommunication procedure according to one of the preceding claims, further characterized in that at least some of the aforementioned first and second mobile subscriber identifications (IMSI1, IMSI2) chained with a common call number (MSISDN) are stored in different identification modules.

5. Telecommunication procedure according to one of the preceding claims, further characterized in that said first mobile subscriber identification (IMSI1) in a local register (HLR) of the local mobile radiotelephone network (HPLMN) is stored and because a said second mobile subscriber identification (IMSI2) of the first mobile subscriber identification (IMSI1) is converted to the code.

6. Telecommunication procedure according to one of claims 1 to 4, further characterized in that both the first and the second mobile subscriber identification (IMSI1, IMSI2) are stored in the local registry (HLR) of the local radiotelephony network Mobile (HPLMN) and are chained with a unique call number (MSISDN).

7. Telecommunication procedure according to the preceding claim, further characterized in that only a mobile subscriber identification (IMSI1, IMSI2) is active at all times.

8. - Telecommunication procedure according to claim 2, further characterized in that at least some of said first and second mobile subscriber identifications (IMSI1, IMSI2) chained with a common call number (MSISDN), which are stored with the same identification module, can be activated by the subscriber with input means of the terminal unit (1).

9. Telecommunication procedure according to one of the preceding claims, further characterized in that the subscriber is elaborated separate accounts for at least some of the aforementioned first and second mobile subscriber identifications (IMSI1, IMSI2) chained to a number call (MSISDN) common.

10. Telecommunication system according to one of the preceding claims, further characterized in that the respective subscriber is elaborated a common account for at least some of the aforementioned first and second mobile subscriber identifications (IMSI1, IMS12) chain with a common call number (MSISDN).

11. Telecommunication procedure according to one of the preceding claims, further characterized in that said mobile radiotelephone networks are GSM networks.

12. Identification module that is intended for use in a mobile radiotelephone (1) and that makes it possible to store at least two mobile subscriber identifications (IMSI1, IMSI2), further characterized by containing at least a first identification of mobile subscriber (IMSI1) of the range of numbers of a local mobile radio network (HPLMN) and a second mobile subscriber identification (IMSI2) of the range of numbers of a partner network (PPLMN), whereby the two identifications of mobile subscriber (IMSI1, IMSI2) are chained with a common call number (MSISDN). 13.- Programmable device, in which a local registry (HLR) is stored, whereby the local registry (HLR) contains for each subscriber of a local mobile radio network (HPLMN) at least one mobile subscriber identification ( IMSI1, IMSI2) and at least one corresponding call number (MSISDN), further characterized in that said local register (HLR) contains at least for some subscribers a first mobile subscriber identification (IMSI1) of the range of numbers of its mobile radiotelephone local network (HPLMN), a second mobile subscriber identification (IMSI2) of the number range of a partner network (PPLMN) and a call number (MSISDN) assigned in common to these two mobile subscriber identifications (IMSI1) , IMSI2). 14. Programmable device according to the preceding claim, with which a flag for each subscriber indicates which of the two mentioned mobile subscriber identifications (IMSI1, IMSI2) is momentarily active.