Who needs the IMSI service and why

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With the help of such a tool, you can exercise full control over the numbers of your client base and protect your clients from fraud associated with the substitution of SIM cards. What is IMSI IMSI is International Mobile Subscriber Identity, which means "international mobile subscriber identifier", which is stored on the SIM card and usually consists of 15 digits. When registering with the network, the subscriber's device automatically transmits the IMSI, by which it is identified. Each SIM card has its own identifier. If the user changes the SIM card, the number will remain the same, but the code will change. Thus, the IMSI service helps to track the fact of SIM card replacement. This helps to prevent possible cases of fraud related to message substitution. The IMSI service is used by various financial institutions.



The main function of the tool is to ensure the usa phone number list safe execution of payment transactions, during which SMS passwords, authorization codes, data on the write-off or receipt of funds, etc. are transmitted. Code verification is required in various cases: when logging into online banking; changing the PIN code of a bank card; confirmation of payment transactions using one-time passwords sent via SMS. If a fraudster gets hold of a specific user's SIM card, he will be able to receive messages from the bank, which will give him access to his personal account at the bank, all bank cards and accounts. By pre-checking the subscriber ID, it is possible to avoid situations where the SMS is sent directly to the fraudster. How does IMSI service work? The IMSI service checks the authenticity of the SIM card before sending an SMS, i.e. determines whether the subscriber ID with a specific phone number has changed.



By checking the code, it is possible to track: attempts to use a duplicate SIM card; using blocked SIM cards; substitution of the subscriber's telephone number in the customer's accounting system. This is made possible by the IMSI service, a separate component with its own API (set of functions), which is integrated with the bank's SMS gateway on the one hand, and with the operator's infrastructure on the other. The principle of code verification: When the bank receives the first IMSI value, it saves its value in its database as a reference for the current client. For any operation that requires sending an SMS, the organization first accesses its database to compare the IMSI values ​​- the reference one and the one received before sending. Depending on whether the two compared codes match or not, the bank makes a decision on further actions.