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Describe the function of the International Mobile Station Equipment Identity (IMEISV).

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The International Mobile Station Equipment Identity (IMEI) is a unique identifier assigned to a mobile device to distinguish it from other devices in a mobile network. The IMEISV (IMEI with Software Version) is an extension of the IMEI that includes information about the software version running on the mobile device. Here's a technical explanation of the function of the IMEISV:

  1. Structure of IMEISV:
    • The IMEISV is a 15-digit code, similar to the IMEI. The first 14 digits represent the IMEI, and the last digit is reserved for the Software Version (SV).
  2. Unique Device Identification:
    • The primary function of IMEISV is to provide a globally unique identification for mobile devices. Each IMEISV is unique to a specific device and serves as a means to differentiate it from other devices in the mobile network.
  3. Composition of IMEI:
    • The IMEISV is composed of three components:
      • Type Allocation Code (TAC): The first eight digits represent the TAC, which identifies the device manufacturer and model.
      • Serial Number (SNR): The next six digits are the serial number, which uniquely identifies an individual device.
      • Software Version Number (SVN): The last digit represents the Software Version Number.
  4. Manufacturer and Device Information:
    • The TAC part of the IMEISV provides information about the device manufacturer and model. It is assigned by the GSM Association and is specific to each device type.
  5. Serial Number:
    • The serial number part of the IMEISV uniquely identifies a particular device within a specific device type.
  6. Software Version Number:
    • The last digit of the IMEISV, the Software Version Number, indicates the version of the software or firmware running on the device. This is particularly useful for tracking software updates and versions.
  7. IMEISV Registration and Verification:
    • Mobile network operators maintain a database of registered IMEISVs to track valid devices on their networks.
    • During the device registration process, the network verifies the IMEISV to ensure that the device is authorized to connect to the network.
  8. Device Blacklisting and Security:
    • IMEISV plays a crucial role in the security and integrity of mobile networks. If a device is reported as stolen or lost, the network operator can blacklist its IMEISV, preventing it from connecting to the network.
  9. Support for Over-the-Air (OTA) Updates:
    • The inclusion of the Software Version Number in IMEISV allows mobile operators and device manufacturers to track software versions across the network.
    • This information is valuable for managing over-the-air (OTA) software updates, ensuring that devices are running the latest and most secure software versions.
  10. Device Management and Troubleshooting:
    • IMEISV serves as an important tool for device management and troubleshooting. Mobile operators can use IMEISV information to track device types, software versions, and identify potential issues related to specific device models or software versions.
  11. Regulatory Compliance:
    • IMEISV compliance is essential for regulatory purposes. Mobile devices with valid and compliant IMEISVs are authorized to operate on mobile networks in accordance with regulatory requirements.

In summary, the IMEISV is a unique identifier for mobile devices that includes information about the device manufacturer, model, serial number, and software version. It serves critical functions in device identification, network security, software management, and regulatory compliance within mobile networks.