Understanding ICCID Numbers and Their Importance in Cellular IoT

In the rapidly evolving world of cellular IoT, grasping the significance of ICCID numbers is essential. An ICCID (Integrated Circuit Card ID) is a globally unique identifier for SIM cards, playing a crucial role in device management and network operations.

Connectivity / SIM technology / Cellular Networks

This article explores the structure and importance of ICCID numbers, highlighting their relevance in modern telecommunications, especially for Com4 customers.

What is an ICCID Number?

ICCID stands for Integrated Circuit Card ID, a distinctive 19- or 20-digit serial number printed on every SIM card. This identifier is crucial for recognizing and managing SIM cards within cellular networks.

The Structure of ICCID Numbers

ICCID numbers are meticulously structured to provide specific information:

Industry Identifier: The first two digits are always 89, signifying the telecommunications industry
  • Country Code: The next two or three digits represent the country code, determined by the International Telephony Union (ITU).
  • Mobile Network Code (MNC): Following the country code, the next one to four digits identify the SIM card's home network.


  • Unique Identifier: The remaining digits uniquely identify the SIM card, ending with a check digit calculated using the Luhn algorithm.


Why ICCID Numbers Matter for Com4 Customers

ICCID numbers are fundamental for various reasons:

  • Device Identification: Crucial for identifying the SIM card within a device, enabling seamless connectivity.
  • Network Operations: Essential for network providers like Com4 to manage and provision services effectively.
  • Customer Support: Needed for activating services, troubleshooting issues, and assisting customers with their accounts.

Finding Your ICCID Number

Locating the ICCID number is straightforward. It’s typically printed on the SIM card itself or on the packaging. For mobile devices, you can also find it within the device settings under the "About" or "SIM Card" section.


Comparing ICCID with Other Mobile Identifiers

IMSI (International Mobile Subscriber Identity)

The IMSI is a 15-digit number used by cellular networks to identify the subscriber’s line of service. It includes:

  • Mobile Country Code (MCC): The first three digits.
  • Mobile Network Code (MNC): The next two or three digits.
  • Subscriber Identification: The remaining digits.

IMEI (International Mobile Equipment Identity)

The IMEI is a unique 15-digit number assigned to mobile devices, identifying the device itself rather than the SIM card. It consists of:

  • Reporting Body Identifier: The first two digits.
  • Type Allocation Code (TAC): The next six digits.
  • Device Identifier: The following six digits.
  • Check Digit: The final digit, calculated using the Luhn algorithm.

The Role of ICCID in Embedded SIM Technology

Embedded SIM (eSIM) technology is revolutionizing mobile networking. Unlike traditional SIM cards, eSIMs are soldered onto the device's motherboard and can store multiple SIM profiles, managed remotely via eUICC (Embedded Universal Integrated Circuit Card) technology. This innovation enhances flexibility and efficiency in device management.

eUICCID: The New Identifier for eSIMs

With eSIM technology comes a new identifier, the eID. This number is distinct from the traditional ICCID, accommodating the complexities of remote provisioning and multi-party relationships in SIM manufacturing and network management.

Get Started with Com4

Understanding the ICCID and its role in cellular IoT is crucial for leveraging the full potential of Com4’s services. Ready to deploy your IoT devices? Create an account with Com4 and get started with our advanced SIM solutions.

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