Wireless communications system and method of operation for reducing fraud

<u style="single">Background of the invention</u>The use of wireless communication as a means of personal communication, especially the use of cellular telephones, is recognized to have undergone a substantial (if not huge) increase in recent years. The increasing and expanding use of cellular phones in personal communications is astounding in many ways, but there are still significant obstacles to reaching the majority of the general population. Like many emerging industries, the cellular telephone industry is plagued and hurt by a relatively small proportion of the general public with the intent of stealing from service providers or carriers. A relatively small proportion of the general public has discovered a variety of ways to bypass existing defenses. The cost of these "customer" frauds in the cellular phone industry is estimated to exceed $ 3 million per day. The proliferation of fraud in the cellular phone industry has forced carriers to adopt a variety of technologies to reduce their chances of stealing from their carriers. An obvious method is to limit access to the system to subscribers who appear to have very high financial credibility and maintain a list of former subscribers who have previously been scammed by carriers. The main problem with this approach is that it eliminates a very large proportion of the general population, consisting of individuals who do not meet the criteria of very high financial credibility but are otherwise credible and desire cellular telephone services. It is a point that ends up. As a result, this approach severely limits the opportunity for further increase in use when (if not required) is required for the expansion of the cellular telephone industry. Efforts to reduce the degree to which carriers are financially exposed to these malicious acts are also hampered by the very excess features and options currently offered to users in various forms of wireless communication, including cellular phones. There is. Perhaps the most desired feature for cellular telephone subscribers is "roaming" services in areas where home carriers are not serviced. These features and options are actually billed by the customer However, the burden of using these features is at least initially borne by the home carrier. However, home carriers cannot continue to control the availability of these features and options in all potential markets. This is because in areas serviced by other carriers, access to services and features may be granted in real time without the home carrier's knowledge. The inability to selectively control access to the various features offered to wireless communication users provides services in the fundamental nature of the wireless communication industry and in an effective geographic range. Based on the basic fact that the wireless communications industry relies on networks of different carriers for this purpose. Before providing a local connection to a visiting cellular telephone subscriber, the "remote" or serving carrier first checks the subscriber's financial credibility. More precisely, make sure that the home carrier accepts financial liability for the charges incurred by the subscriber. In doing so, cellular telephone subscribers are identified by their individual mobile identification number (MIN) and specific electronic serial number (ESN). In response to a service request by a subscriber moving (roaming) within the service area of a remote carrier, these numbers are transferred from the "remote" cellular telephone carrier to the subscriber's home carrier, the existing message protocol IS-41 ( Rev. Communicated by A). Based on MIN / ESN, the home carrier electronically confirms whether the requested service can be accessed by the cellular telephone subscriber. Specifically, the home carrier keeps a home locator record (HLR) for each subscriber. Home locator records provide data about a particular subscriber, including data that identifies the features and options that the subscriber can receive. In traditional cellular telephone systems, home locator records are usually pre-created by the operator and cannot be modified by the carrier during the verification process. Then, in the service area of the remote serving carrier, when there is a wireless communication service request relating to the subscriber of the home carrier, the home carrier transmits the home locator record of the subscriber to the serving carrier. This creates a visitor locator record (VLR) for the subscriber that defines the type and level of service to be provided to the subscriber while roaming. One way to reduce the risk of carriers being exposed to fraud is to provide local prepaid wireless communication services. According to this technique, the carrier can incorporate an existing system used for billing, for example, to monitor the time actually used by a cellular telephone subscriber. And when the subscriber uses it near the prepaid limit, it limits and / or discontinues the service accordingly, thereby limiting the risk of the carrier. The problem with this approach is that prepaid services are generally limited to the geographic area served by the home carrier. Cellular telephone subscribers are not allowed to roam because they cannot monitor or limit their use outside the service area of their home carrier. Include the exchange platform's phone number in the "HOTLINE" field of the subscriber's visitor locator record (VLR), and this exchange platform will be set by the subscriber. By detecting whether the ruler telephone service has been paid in advance, the wireless communication system can control the outgoing call. However, issues related to call termination for prepaid subscribers have not been addressed. In this regard, prepaid subscriber call termination issues are more difficult to resolve than those of outgoing calls, as calls received by subscribers can be directly connected to the roaming access port of a "remote" serving carrier. Is. WO-A-96 36192 includes the wireless communication system described in the preamble of claims 1, the wireless communication exchange platform described in the preamble of claims 8, and the multiple subscriptions described in the preamble of claims 14. It discloses a method of selectively providing wireless communication services to a person. This document relates to the provisions of UPT systems (ie, universal Personal Telecommunications systems). In this system, the user can access the communication service without being bound by a specific operator. In other words, the system gives the user free access to the network of any operator. Thus, in the wireless communications industry and especially in the cellular telephone industry, wireless communication systems and systems that allow subscribers access to sufficient features and options, including roaming, while limiting the risk of carriers being exposed to potential customer fraud. Related operational methods are needed. More specifically, there is a need for wireless communication systems and related operations that allow carriers to perform call terminations to roaming subscribers. Problems related to termination) have not been addressed. In this regard, prepaid subscriber call termination issues are more difficult to resolve than those of outgoing calls, as calls received by subscribers can be directly connected to the roaming access port of a "remote" serving carrier. Is. WO-A-96 36192 includes the wireless communication system described in the preamble of claims 1, the wireless communication exchange platform described in the preamble of claims 8, and the multiple subscriptions described in the preamble of claims 14. It discloses a method of selectively providing wireless communication services to a person. This document relates to the provisions of UPT systems (ie, universal Personal Telecommunications systems). In this system, the user can access the communication service without being bound by a specific operator. In other words, the system gives the user free access to the network of any operator. Thus, in the wireless communications industry and especially in the cellular telephone industry, wireless communication systems and systems that allow subscribers access to sufficient features and options, including roaming, while limiting the risk of carriers being exposed to potential customer fraud. Related operational methods are needed. More specifically, there is a need for wireless communication systems and related operations that allow carriers to perform call terminations to roaming subscribers. Problems related to termination) have not been addressed. In this regard, prepaid subscriber call termination issues are more difficult to resolve than those of outgoing calls, as calls received by subscribers can be directly connected to the roaming access port of a "remote" serving carrier. Is. WO-A-96 36192 includes the wireless communication system described in the preamble of claims 1, the wireless communication exchange platform described in the preamble of claims 8, and multiple subscriptions described in the preamble of claims 14. It discloses a method of selectively providing wireless communication services to a person. This document relates to the provisions of UPT systems (ie, universal Personal Telecommunications systems). In this system, the user can access the communication service without being bound by a specific operator. In other words, the system gives the user free access to the network of any operator. Thus, in the wireless communications industry and especially in the cellular telephone industry, wireless communication systems and systems that allow subscribers access to sufficient features and options, including roaming, while limiting the risk of carriers being exposed to potential customer fraud. Related operational methods are needed. More specifically, there is a need for wireless communication systems and related operations that allow carriers to perform call terminations to roaming subscribers. The 36192 includes the wireless communication system described in the preamble of claims 1, the wireless communication exchange platform described in the preamble of claims 8, and the wireless communication service to multiple subscribers described in the preamble of claims 14. Is disclosed as a method for selectively providing the above. This document relates to the provisions of UPT systems (ie, universal Personal Telecommunications systems). In this system, the user can access the communication service without being bound by a specific operator. In other words, the system gives the user free access to the network of any operator. Thus, in the wireless communications industry and especially in the cellular telephone industry, wireless communication systems and systems that allow subscribers access to sufficient features and options, including roaming, while limiting the risk of carriers being exposed to potential customer fraud. Related operational methods are needed. More specifically, there is a need for wireless communication systems and related operations that allow carriers to perform call terminations to roaming subscribers. The 36192 includes the wireless communication system described in the preamble of claims 1, the wireless communication exchange platform described in the preamble of claims 8, and the wireless communication service to multiple subscribers described in the preamble of claims 14. Is disclosed as a method for selectively providing the above. This document relates to the provisions of UPT systems (ie, universal Personal Telecommunications systems). In this system, the user can access the communication service without being bound by a specific operator. In other words, the system gives the user free access to the network of any operator. Thus, in the wireless communications industry and especially in the cellular telephone industry, wireless communication systems and systems that allow subscribers access to sufficient features and options, including roaming, while limiting the risk of carriers being exposed to potential customer fraud. Related operational methods are needed. More specifically, there is a need for wireless communication systems and related operations that allow carriers to perform call terminations to roaming subscribers. Regarding the provisions of system)). In this system, the user can access the communication service without being bound by a specific operator. In other words, the system gives the user free access to the network of any operator. Thus, in the wireless communications industry and especially in the cellular telephone industry, wireless communication systems and systems that allow subscribers access to sufficient features and options, including roaming, while limiting the risk of carriers being exposed to potential customer fraud. Related operational methods are needed. More specifically, there is a need for wireless communication systems and related operations that allow carriers to perform call terminations to roaming subscribers. Regarding the provisions of system)). In this system, the user can access the communication service without being bound by a specific operator. In other words, the system gives the user free access to the network of any operator. Therefore, in the wireless communications industry and especially in the cellular telephone industry, wireless communication systems and systems that allow subscribers access to sufficient features and options, including roaming, while limiting the risk of carriers being exposed to potential customer fraud. Related operational methods are needed. More specifically, there is a need for wireless communication systems and related operations that allow carriers to perform call terminations to roaming subscribers.<u style="single">Outline of the invention</u>The above-mentioned drawbacks of the wireless communication system are overcome according to the present invention. According to the present invention, the subscriber can temporarily change the setting (reconfigure) of the information held in the subscriber's home locator record in real time (in other cases, the home locator record is unchanged). Selective call termination connection (call) while roaming in the external market (ie, the service area outside the home carrier's service area) termination) is allowed. Here, the subscriber's home locator record is reconfigured in response to a wireless communication service request only if the subscriber has paid in advance for a requesting service such as roaming and wishes to receive a call. To. During the call, the balance of the paid service is monitored and the service is stopped as soon as the paid balance is exhausted. When the request service is terminated, the subscriber's home locator record is reset to prohibit call termination. This further protects the home carrier from fraud. Call termination is not allowed without changing the settings of the subscriber's home locator record, thus protecting the home carrier from subsequent attempts to contact the roaming subscriber, for example, through the roaming access port of the serving carrier. The wireless communication system of the present invention includes a home carrier and HLR memory means associated with the home carrier. The HLR memory means stores a database of home locator records. The home locator record database contains a number of home locator records that define the services that should be provided to home carrier subscribers. Each subscriber's home locator record is set (configure) to allow only emergency direct phone calls and prohibit call termination, at least initially. The wireless communication system further includes a configuration change means for temporarily reconfiguring the subscriber's home locator record in response to a communication service request relating to the subscriber receiving the call. For example, the request is a call termination permit request for a subscriber roaming outside the service area of the home carrier. In response to this request, the configuration change means modifies the subscriber's home locator record if the subscriber has paid for the requested service. For communication service requests involving a home carrier subscriber who was roaming outside the home carrier's service area, wireless communication systems and methods first allow the subscriber to pay for the requested service in advance. Whether or not Is detected. In this regard, wireless communication systems can include account memory means for storing account information of home carrier subscribers. This account information may include information about specific services such as long-distance calling and roaming that each subscriber has paid in advance. When it detects that the subscriber's account has sufficient balance for the requesting service and that the call to be transmitted to the subscriber is pending, the reconfiguration means at least records the subscriber's home locator. Temporarily change the setting to allow call termination. The wireless communication system and method then transfers the subscriber's reconfigured home locator record to the serving carrier (typically IS-41 (Rev.). Supply (via A) messaging). The serving carrier then provides the requested wireless communication service. When the requesting service is provided by the serving carrier, the wireless communication system and method monitor the account memory means. As soon as the subscriber's account information indicates that the service prepaid by the subscriber has been exhausted, the wireless communication system and method will cease the requested service. When the request service is terminated either by the completion of the call or the exhaustion of the paid service, the configuration change means resets the subscriber's home locator record, which causes the home locator record to terminate the call to the subscriber. Is banned again. As a result, wireless communication systems are further protected from fraud. This is because the subscriber's home locator record is reset and the call termination is again prohibited for that subscriber, so calls to the roaming subscriber via the serving carrier's roaming access boat are not connected. .. In this way, a particular subscriber can access commonly desired features of the wireless communication system, such as roaming subscriber call termination, on a per-process basis. At the same time, home carriers can substantially limit the risk of exposure to fraud by people in a relatively small portion of the potential market for wireless communications services. According to the present invention, the risk of the carrier is limited, so that the carrier can expand the range of potential subscribers to attract customers with slightly lower financial credibility.<u style="single">[Simple explanation of drawings]</u>The aforementioned and other advantages and features of the present invention, as well as the method of achieving the present invention, can be described by pondering the following detailed description of the present invention with reference to the accompanying drawings showing suitable and representative embodiments. , Will be clearer. FIG. 1 is a schematic block diagram showing the basic components of a wireless communication system according to the present invention, including a home carrier having HLR memory means and associated account memory means. FIG. 2 is a schematic block diagram showing a wireless communication exchange platform according to one embodiment of the present invention. FIG. 3 is a schematic block diagram showing various communication links within a wireless communication system according to another embodiment of the present invention. FIG. 4 is a flowchart showing the operation performed by the wireless communication system and method according to one embodiment.<u style="single">Detailed description of preferred embodiments</u>Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings showing preferred embodiments. However, the present invention can be implemented in a number of different embodiments and should not be construed as limited to the embodiments described below. Rather, the following embodiments are presented for the purpose of making the disclosure thorough and complete and fully communicating the scope of the invention to those skilled in the art. Throughout, the same sign represents the same element. FIG. 1 shows a wireless communication system 10 according to one embodiment of the present invention. This communication system will be described below primarily in the context of cellular telephone systems, where wireless communication systems can be any cellular or digital communication system, such as AMPS cellular systems, digital cellular systems, or personal mobile communication systems. , Can be included without departing from the scope of the present invention. The wireless communication system 10 typically includes a plurality of carriers 12 that provide wireless communication services within their respective predetermined service areas. Those carriers are generally connected to a communication network 14, such as a related public exchange telephone network. Then, the communication network 14 communicates with one or more terminals such as the terrestrial communication line telephone terminal 16 shown in FIG. In a cellular telephone system, for example, a dual communication link may be implemented between two cellular terminals or between a cellular terminal and a terrestrial communication line telephone terminal. Each carrier 12 provides wireless communication services to a number of subscribers within a predetermined service area of the carrier. Thus, the subscriber has a home carrier 12a contracted to receive wireless communication services and a number of "remote" carriers with different service areas. A "remote" carrier may act as a serving carrier 12b when the subscriber goes out of the service area of the home carrier and roams within the service area of the remote carrier. In the cellular communication system, the service areas of the cellular carrier are cell 1, cell 2, ... It is divided into a number of cells 18 labeled cell n. Carriers include a radio base station within each cell and corresponding antennas, as well as a mobile telephone exchange (MTSO) 20 that acts as a central coordinating element for all cells. The MTSO20 typically includes a processor 22, such as a computer-based account processor, and a telephone exchange 24. MTSOs also typically work with the telco's zone stations to manage call processing and handle billing. According to the present invention, both the HLR memory means 26 and the account memory means 28 are associated with the home carrier 12a. HLR memory means and / or account memory means may form part of the home carrier's MTSO20 or, as shown in Figures 1 and 2, are located outside the home carrier's MTSO and communicate with that MTSO. It may be configured as follows. The HLR memory means 26 typically includes a memory device that stores a home locator recording database. The home locator record database contains a number of home locator records that specify the wireless communication services to be provided to each subscriber of the home carrier 12a. Each subscriber's home locator record defines, for example, the features and options selected by the subscriber. One of the many functions specified by the subscriber's home locator record is call termination (call). termination). The call termination indicates whether the subscriber is allowed to receive calls, including calls made while traveling outside a predetermined service area of the home carrier. The account memory means 28 also typically includes a memory device that stores account information for each subscriber of the home carrier 12a. According to the present invention, the subscriber can pre-pay for the selected wireless communication service. For example, a subscriber can pre-pay for a multifunctional wireless communication system 10 that controls all aspects of wireless communication regardless of where the subscriber is (ie, at home or roaming). The carrier burden is removed. As shown in Figure 2, the MTSO20 of the home carrier 12a was specially developed as an exchange platform that provides a number of wireless communication services to a large number of subscribers while protecting the home carrier from fraud. As shown in FIG. 2, the exchange platform according to the present invention sets the home locator record of a subscriber at least temporarily in response to a request for a wireless communication service relating to the subscriber outside the predetermined service area of the home carrier. Includes setting changing means 30 to be changed. For example, the request may be an incoming call requesting a call termination to a subscriber outside a predetermined service area of the home carrier. As described below, the configuration change means 30 will only be available if the account information stored in accordance with the account memory means 28 indicates that the requested wireless communication service has been prepaid by the subscriber. Change the settings of the subscriber's home locator record. If the subscriber has prepaid for the requested wireless communication service, the configuration change means is the subscriber's home while the subscriber is moving out of the service area of the home carrier 12a. Reconfigure the locator record at least temporarily to allow the requested function, namely call termination. Below, the setting changing means is used as the home carrier 12a. The process of changing the setting of the home locator record for permitting the call termination including the call termination outside the predetermined service area of the above will be described. However, the setting change means may change the setting of the home locator record in order to selectively allow the subscriber to temporarily use other functions while the subscriber is moving outside the predetermined service area of the home carrier. It is possible. At the end of the requested wireless communication service, the configuration change means 30 resets the subscriber's home locator record, prohibits call termination for subscribers outside the predetermined service area of the home carrier 12a, and so on. Prohibit the requested function again. As described below, the exchange platform 20 of the present invention allows call termination while traveling outside a predetermined service area of the home carrier 12a only in certain cases prepaid by the subscriber. Reduce (if not prevent) fraud. The exchange platform 20 may also include a monitoring means 32 that monitors the account memory means 28 while the exchange platform provides the requested wireless communication service, as shown in FIG. If the subscriber's home locator record is temporarily reconfigured to allow call termination, the monitoring means is provided by the subscriber while the subscriber is moving out of the predetermined service area of the home carrier 12a. You can continue to monitor account information related to prepaid wireless communication services. In this regard, when a subscriber begins to use a paid wireless communication service, the subscriber's account information is changed by the processor 22, preferably in real time. The account information thereby accurately reflects the remaining amount of paid services available to the subscriber. The exchange platform 20 also preferably includes call continuation control means 34 that terminates the requested wireless communication service. As soon as the account information indicates that all of the prepaid wireless communication services have been used up by the subscriber, the monitoring means 22 notifies the call continuation control means. Then The call continuation control means terminates the wireless communication service by disconnecting the subscriber's call or the like. As mentioned above, the exchange platform 20 includes a switch 24 such as a telephone switch and a processor 22 such as a computer-based account processor. As shown in FIG. 2, the processor can include a setting changing means 30, a monitoring means 32, and a call continuation control means 34. However, the configuration changing means, monitoring means, and / or call continuation control means in one advantageous embodiment are realized by a combination of hardware such as a processor and software such as a computer program product. The computer program product of this advantageous embodiment includes a computer-readable storage medium having computer-readable program code means such as a series of computer instructions. The program code means is implemented within a computer readable storage medium, selectively reconfiguring each subscriber's home locator record, monitoring account memory means, and / or wireless communication of each subscriber. Selectively terminate the service. In this regard, FIGS. 1-4 are block diagrams, flowcharts, and control flow diagrams showing the methods, systems, and program products according to the present invention. Each block or step of the block diagram, flowchart, and control flow diagram, and a combination of blocks of the block diagram, flowchart, and control flow diagram can be implemented by computer program instructions. These computer program instructions are loaded into a computer or other programmable device to form a device. Thereby, an instruction executed by a computer or other programmable device provides a means for performing a function specified in a block diagram, a flowchart, or a (s) block or (s) steps of a control flow. Generate. These computer program instructions also identify a computer or other programmable device. It may be stored in a computer-readable memory that can be legally functioned. Thereby, the instructions stored in the computer-readable memory are a product containing a block diagram, a flowchart, or an instruction means that performs the function specified in the (s) blocks or (s) steps of the control flow. Generate. Computer program instructions can also be loaded into a computer or other programmable device, whereby a series of operating steps is performed by the computer or other programmable device, creating a process performed by the computer. Will be done. Thereby, an instruction executed by a computer or other programmable device provides a step of performing a function specified in a block diagram, a flowchart, or a control flow block or step. To do. Thus, a block or step in a block diagram, flowchart, or control flow diagram performs a combination of means for performing a specified function, a combination of steps for performing a specified function, and a specified function. Supports program instruction means. In addition, each block or step in a block diagram, flowchart, or control flow diagram, and a combination of blocks or steps in a block diagram, flowchart, or control flow diagram are special purpose hardware that performs the specified function or step. It will be understood that it can be implemented using a base computer system, or a combination of special purpose hardware and computer instructions. The operation of the wireless communication system 10 of the present invention will be described below mainly in relation to the flowchart of FIG. As shown in block 50, the wireless communication system first receives a request for a wireless communication service relating to a subscriber outside the predetermined service area of the home carrier 12a. For example, the exchange platform 20 (more specifically, the exchange 24) according to the present invention may be another carrier (ie, a serving key). It is conceivable to receive a call to a subscriber currently in the area serviced by Charia 12b). In one embodiment, each subscriber of the wireless communication system of the present invention is designated with a separate personal identification number (PIN) as well as a separate telephone number, such as a separate toll-free number or a common toll-free number. ing. Upon receiving a call to a subscriber's designated telephone number, the exchange platform first receives the subscriber's mobile identification number (MIN) and electronic serial number based on the subscriber's individual toll-free number or subscriber's individual PIN. Identify (ESN). The exchange platform 20 and (more specifically) monitoring means 32 then pay the subscriber for the requested wireless communication service, such as for roaming, and more specifically for call termination during the subscriber's roaming. Detects if it has been done in advance. See block 52. If the subscriber's account information indicates that the subscriber has not paid in advance for any service that has not been previously used or used up, the exchange platform will prioritize the call before disconnecting. Send a message to the caller, such as "The cellular phone you called has been temporarily suspended." See block 54. If the subscriber has paid in advance for the requested wireless communication service, the exchange platform will detect if the subscriber is currently busy on another call. See block 56. If so, the exchange platform preferably forwards the received call to voicemail, as shown in block 58, allowing the caller to leave a message to the subscriber. If the subscriber has paid in advance for the requested wireless communication service and the subscriber is not on a call on another call, the exchange platform 20 and (more specifically) the configuration change means 30 will be said to be Temporarily change the settings of the subscriber's home locator record to allow call termination. As a result, the current home carrier 12a Call termination requests relating to subscribers outside the service area are met, i.e. the call is fulfilled. See block 60. When the subscriber's home locator record is reconfigured, a temporary local dialing number (TLDN) is requested from the serving carrier 12b. See block 62. In the embodiment shown in FIG. 1, the exchange platform according to the present invention can request a TLDN from a serving carrier via, for example, switch-to-switch communication (SS-7). In contrast, in the embodiment shown in FIG. 3, the HLR memory means 26 is a component of the HLR node 36, which is the HLR node with both the exchange platform (ie home MTSO) and the serving carrier (ie serving MTSO). It is configured to be able to communicate. In this embodiment, when the subscriber's home locator record is reconfigured, the home carrier can issue a carrier-to-carrier request to the serving carrier through the HLR node. In both embodiments, in response to the home carrier's TLDN request, the serving carrier 12b requires a visitor (visitor) locator record from the home carrier 12a. As mentioned above, a subscriber's visitor locator record is based on the subscriber's current home locator record. Therefore, the wireless communication system 10 of the present invention reconfigures the subscriber's home locator record before transmitting the subscriber's current visitor locator record to the serving carrier through the exchange platform 20 or HLR node 36. Thereby, the visitor locator record of the subscriber held by the serving carrier is created or updated. See block 64. The serving carrier supplies the TLDN to the exchange platform because the reconfigured home locator record currently allows the subscriber to terminate the call. See block 66. The serving carrier, for example, shows the TLDN for the subscriber in FIG. It may be supplied to the exchange platform through switch-to-switch communication as shown in the above case, or it may be supplied through an intercarrier signal such as an HLR node as shown in FIG. Upon receiving the TLDN, the exchange platform and (more specifically) switch 24 dial the TLDN to carry the received call. See block 68. During the period in which the subscriber's phone remains off-hook following the transmission of the call, the account information in the account memory means 28 associated with the subscriber is changed, thereby paying by the subscriber and to the subscriber. The remaining amount of wireless communication services provided is reduced. See block 70. For example, the processor 22 may repeatedly reduce the remaining paid time of the subscriber while the subscriber's telephone remains off-hook. As shown in block 78, the exchange platform 20 repeatedly detects whether the subscriber has completed the call, such as by turning the phone on-hook or otherwise terminating it. When the exchange detects that the call is incomplete, the exchange platform and (more specifically) monitoring means 32 continue to monitor the subscriber's account information, allowing the subscriber to pay for further wireless communication services. Detects whether you are eligible to receive the service. See block 72. If the subscriber's account information indicates that the paid service has been used up by the subscriber, the monitoring means notifies the call continuation control means 34 and the call continuation control means suspends the service (ie, disconnects the call). .. See block 80. Conversely, if the subscriber's account information indicates that the subscriber is eligible for further service, the monitoring means will be followed by the remaining wireless communication service paid by the subscriber, for example 10 minutes. Detect if it is a small amount such as less than. See block 74. If so, the exchange platform will notify the subscriber of the remaining time so that the subscriber can complete the call within the remaining time. Block 7 See 6. If not, this monitoring process continues, as shown in Figure 4. If the call is terminated by any of the actions of the subscriber, or the call continuation control means 34 when the paid service is used up, the exchange platform 20 and (more specifically) the configuration change means 30 call the call. Before canceling, reset the subscriber's home locator record to prohibit call termination. See blocks 82 and 84. By resetting the subscriber's home locator record and prohibiting call termination, the wireless communication system 10 of the present invention (prevents) fraud by not allowing unauthorized access to any of the subscribers. Reduce (if not). Specifically, subsequent calls to the roaming access port of the serving carrier 12b requesting a call termination for the roaming subscriber of the home carrier 12a are not completed. This is because the subscriber's home locator record supplied to the serving carrier is back in a state indicating that the subscriber's call reception is prohibited. Accordingly, the wireless communication systems and methods of the present invention call to subscribers during roaming on a limited prepaid basis while reducing (if not preventing) fraudulent activity against home / serving carriers. Allow termination. As a result, according to the present invention, the risk of the carrier is limited, so that the carrier can expand the range of potential subscribers to attract customers with slightly lower financial credibility. The drawings and the present specification describe preferred embodiments of the present invention. Although specific terms have been used here, they are used for general and descriptive purposes only and are not intended to be limiting. The scope of the present invention is described in the following claims. 20 and (more specifically) the configuration change means 30 reset the subscriber's home locator record to prohibit call termination before canceling the call. See blocks 82 and 84. By resetting the subscriber's home locator record and prohibiting call termination, the wireless communication system 10 of the present invention (prevents) fraud by not allowing unauthorized access to any of the subscribers. Reduce (if not). Specifically, subsequent calls to the roaming access port of the serving carrier 12b requesting a call termination for the roaming subscriber of the home carrier 12a are not completed. This is because the subscriber's home locator record supplied to the serving carrier is back in a state indicating that the subscriber's call reception is prohibited. Accordingly, the wireless communication systems and methods of the present invention call to subscribers during roaming on a limited prepaid basis while reducing (if not preventing) fraudulent activity against home / serving carriers. Allow termination. As a result, according to the present invention, the risk of the carrier is limited, so that the carrier can expand the range of potential subscribers to attract customers with slightly lower financial credibility. The drawings and the present specification describe preferred embodiments of the present invention. Although specific terms have been used here, they are used for general and descriptive purposes only and are not intended to be limiting. The scope of the present invention is described in the following claims. 20 and (more specifically) the configuration change means 30 reset the subscriber's home locator record to prohibit call termination before canceling the call. See blocks 82 and 84. By resetting the subscriber's home locator record and prohibiting call termination, the wireless communication system 10 of the present invention (prevents) fraud by not allowing unauthorized access to any of the subscribers. Reduce (if not). Specifically, subsequent calls to the roaming access port of the serving carrier 12b requesting a call termination for the roaming subscriber of the home carrier 12a are not completed. This is because the subscriber's home locator record supplied to the serving carrier is back in a state indicating that the subscriber's call reception is prohibited. Accordingly, the wireless communication systems and methods of the present invention call to subscribers during roaming on a limited prepaid basis while reducing (if not preventing) fraudulent activity against home / serving carriers. Allow termination. As a result, according to the present invention, the risk of the carrier is limited, so that the carrier can expand the range of potential subscribers to attract customers with slightly lower financial credibility. The drawings and the present specification describe preferred embodiments of the present invention. Although specific terms have been used here, they are used for general and descriptive purposes only and are not intended to be limiting. The scope of the present invention is described in the following claims. A call to the roaming access port of the serving carrier 12b that requires a call termination is not completed. This is because the subscriber's home locator record supplied to the serving carrier is back in a state indicating that the subscriber's call reception is prohibited. Accordingly, the wireless communication systems and methods of the present invention call to subscribers during roaming on a limited prepaid basis while reducing (if not preventing) fraudulent activity against home / serving carriers. Allow termination. As a result, according to the present invention, the risk of the carrier is limited, so that the carrier can expand the range of potential subscribers to attract customers with slightly lower financial credibility. The drawings and the present specification describe preferred embodiments of the present invention. Although specific terms have been used here, they are used for general and descriptive purposes only and are not intended to be limiting. The scope of the present invention is described in the following claims. A call to the roaming access port of the serving carrier 12b that requires a call termination is not completed. This is because the subscriber's home locator record supplied to the serving carrier is back in a state indicating that the subscriber's call reception is prohibited. Accordingly, the wireless communication systems and methods of the present invention call to subscribers during roaming on a limited prepaid basis while reducing (if not preventing) fraudulent activity against home / serving carriers. Allow termination. As a result, according to the present invention, the risk of the carrier is limited, so that the carrier can expand the range of potential subscribers to attract customers with slightly lower financial credibility. The drawings and the present specification describe preferred embodiments of the present invention. Although specific terms have been used here, they are used for general and descriptive purposes only and are not intended to be limiting. The scope of the present invention is described in the following claims.