The IMEI number is linked to the mobile communication module or, in some cases, directly to the IoT product itself. It operates independently of the SIM card, maintaining its unique identification regardless of the SIM card used.
Where Can I Find the IMEI Number?
The IMEI number is typically printed on the exterior of the IoT product for easy visual identification or on the mobile communication module on the circuit board. If an administrative interface is available, you can often find the number there as well. Additionally, if you have access to AT commands, you can retrieve the IMEI number using the command AT+CGSN.
What Does an IMEI Number Consist Of?
The IMEI number is made up of 15 digits, including a check digit, or 16 digits if the IMEI Software Version is included (known as IMEISV).
- TAC (Type Allocation Code): The first 8 digits identify the manufacturer and model.
- Serial Number: The next 6 digits are unique to each device.
- Checksum or Software Version: The last digit is a check digit for the IMEI, or the last two digits are a Software Version number if IMEISV is used.
How Is the IMEI Number Used?
When a new connection is established or a location update occurs within a mobile network, the IMEI number is included in the signaling process. Mobile operators use the EIR (Equipment Identity Register) to block connections from stolen or blacklisted devices.
Different geographic regions may track IMEI numbers to prevent permanent roaming of devices without approved agreements with the mobile operator. For continuous service in such regions, it is essential to use operators like Com4, which have the necessary agreements and solutions in place.
By identifying the TAC within the mobile network, operators like Com4 can assist in accurately troubleshooting equipment, thanks to their comprehensive knowledge of the characteristics and functionality of most mobile communication modules and IoT products on the market.
As an additional security measure, operators like Com4 can lock the SIM card to the IMEI. In case of SIM card theft, this ensures the SIM card cannot be used in any other device than the one with the original IMEI number.
What Is the Difference Between ICCID, IMSI, and IMEI?
ICCID, IMSI, and IMEI play different but complementary roles in identifying mobile and IoT devices:
- ICCID (Integrated Circuit Card Identifier): This unique serial number identifies the SIM card. The ICCID number is usually printed on the SIM card itself and contains information about the card’s origin, including the country and operator. It is used by mobile operators to manage SIM cards and link them to specific subscription plans and account types.
- IMSI (International Mobile Subscriber Identity): IMSI is a unique identifier linked to the mobile subscriber and is stored on the SIM card. It is used in mobile network signaling to authenticate and authorize the user and to assign the correct subscription and services to the device.
- IMEI (International Mobile Equipment Identity): IMEI is a unique identifier for the mobile device itself, independent of the SIM card. It is used to identify and manage devices within the mobile network.
Together, these three identifiers create a comprehensive infrastructure for security, management, and authentication in IoT communication, with each playing a specific role in identifying the device, SIM card, and subscriber.
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