Understanding the differences between eUICC and Multi-IMSI SIM cards
In the rapidly evolving landscape of IoT (Internet of Things), connectivity is paramount. Two significant technologies that have emerged are eUICC (embedded Universal Integrated Circuit Card) and Multi-IMSI SIM cards. This guide will delve into these technologies, their functionalities, and their respective benefits, helping you make informed decisions for your connectivity needs.
What is an IMSI?
The International Mobile Subscriber Identity (IMSI) is a unique identifier assigned to every mobile subscriber. It consists of 15 digits, which include:
The IMSI is crucial for authenticating users on mobile networks and enabling their devices to connect to the internet. When a device connects to a network, the IMSI is used to verify the subscriber’s identity, ensuring secure access to network services.
What is a Multi-IMSI SIM card?
A Multi-IMSI SIM card can store multiple IMSIs, allowing a single SIM to switch between different mobile network operators (MNOs). This flexibility is particularly beneficial for devices that require seamless connectivity across various regions, as it ensures optimal network coverage and reduces roaming costs.
How Multi-IMSI works
When a Multi-IMSI SIM card is manufactured, multiple carrier subscription profiles are pre-loaded onto the physical SIM. This means that the SIM can hold several IMSIs, each corresponding to a different network provider. The device can then select which network to use based on availability and signal strength.
For example, a device equipped with a Multi-IMSI SIM might connect to a local network when travelling abroad, avoiding high roaming fees associated with the primary network. This functionality is especially beneficial for IoT devices deployed in remote or international locations, where network coverage can vary significantly.
What is eUICC?
An embedded Universal Integrated Circuit Card (eUICC) is a technology that allows for remote management of SIM profiles. Unlike traditional SIM cards, eUICC can store multiple profiles and switch between them over-the-air (OTA). This means that users can change their mobile network provider without needing to physically replace their SIM card.
Key features of eUICC
UICC vs eUICC
A Universal Integrated Circuit Card (UICC) is a traditional SIM card that can hold a single IMSI or multiple IMSIs (in the case of Multi-IMSI). In contrast, eUICC refers specifically to the embedded version that supports remote provisioning and management of multiple profiles.
Differences in functionality
Do eSIMs use IMSI technology?
Yes, eSIMs (which are often synonymous with eUICC) utilise IMSI technology. Each eSIM can store multiple IMSIs, allowing devices to authenticate with multiple different networks. This capability enhances the user experience by providing seamless connectivity across various operators.
The role of IMSI in eSIMs
When a device with an eSIM connects to a network, it uses the IMSI to authenticate the subscriber. The eSIM can switch between different IMSIs based on the available networks, ensuring that the device remains connected even in areas with limited service.
What is the difference between eUICC & eSIM?
While eUICC refers to the technology that enables remote management of SIM profiles, eSIM typically refers to the physical hardware component embedded in devices. Essentially, all eSIMs are eUICC, but not all eUICC implementations are necessarily referred to as eSIMs.
Clarifying the terminology
This distinction is important for understanding how these technologies interact and the benefits they offer.
Benefits of Multi-IMSI
Benefits of eUICC
Which solution should you choose?
The choice between Multi-IMSI and eUICC depends on your specific needs:
Considerations for decision-making
When deciding between Multi-IMSI and eUICC, consider the following factors:
Conclusion
Both eUICC and Multi-IMSI SIM cards offer unique advantages for IoT applications. Understanding the differences between these technologies is crucial for making informed decisions that align with your business needs. Whether you prioritise flexibility, cost-effectiveness, or ease of management, evaluating your specific requirements will help you choose the right solution for your IoT project.
If you need help finding the most effective type of IoT connectivity for an upcoming project, contact our team and we’ll be sure to point you in the right direction.
