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IMSI

International Mobile Subscriber Identity.

Description

The International Mobile Subscriber Identity (IMSI) is a unique identifier assigned to mobile network subscribers, typically stored on the SIM card in a mobile device. It plays a vital role in mobile telecommunications, particularly in the context of Non-Human Identities (NHIs), where devices such as IoT sensors, smart meters, and connected vehicles are identified and authenticated on cellular networks. The IMSI consists of a combination of numbers that include the Mobile Country Code (MCC), Mobile Network Code (MNC), and a unique identifier for the subscriber within that network. This identifier is essential for network operations, including billing, service access, and roaming. In the context of NHIs, the IMSI allows for seamless connectivity and management of various devices, enabling the proliferation of IoT applications. However, because IMSIs can be sensitive information, there are security and privacy considerations associated with their use, necessitating measures to protect them from unauthorized access.

Examples

  • A smart meter that transmits usage data to a utility company using its unique IMSI.
  • A connected vehicle that communicates with traffic management systems via its assigned IMSI.

Additional Information

  • IMSI is typically 15 digits long.
  • It is used in conjunction with other identifiers like IMEI (International Mobile Equipment Identity) to enhance security.

References