The rise of the Internet of Things (IoT) is revolutionizing the business world, offering companies countless opportunities to optimize operations and create added value. At the core of this transformation lies connectivity, a critical element to ensure the seamless and efficient operation of IoT devices.
However, a major challenge arises: how can companies guarantee reliable and high-performing connectivity on a global scale? Businesses must ensure their connected devices can function wherever their customers are, without being limited by a single operator’s coverage or the often restrictive terms of roaming agreements.
Two promising technologies have emerged to tackle this challenge: Multi-IMSI SIM cards and eUICC (embedded SIM cards). Each has its own set of advantages and drawbacks, making the choice crucial for companies looking to deploy optimized IoT solutions.
This article aims to clear up the confusion and shed light on the key differences between Multi-IMSI SIM cards and eUICC.
What is IMSI ?
Understanding Multi-IMSI requires first grasping the concept of IMSI.
The IMSI (International Mobile Subscriber Identity) is a unique identifier assigned to every mobile network subscriber. It is a number of up to 15 digits linked to an operator profile, enabling the identification of the user on the cellular network.
The IMSI plays a key role in subscriber identification, authentication, and tracking. It also facilitates access to mobile device information stored in the HLR (Home Location Register). However, for security reasons, the IMSI is transmitted only occasionally. Instead, a random temporary identifier known as TMSI (Temporary Mobile Subscriber Identity) is used for most communications.
The IMSI is present in all interconnected mobile networks, including GSM, UMTS, and LTE technologies.
Sometimes, the IMSI can be confused with the ICCID, which is the identifier of the SIM card itself. In reality, the IMSI is part of the profile stored on the SIM card (or multiple profiles in the case of Multi-IMSI SIM cards).
What is a Multi-IMSI SIM Card ?
Now that you understand what an IMSI is, a Multi-IMSI SIM is simply a SIM card equipped with multiple IMSIs. This flexibility allows the SIM card to select the appropriate IMSI for each country visited, offering benefits such as reduced data costs and improved coverage.
A single-IMSI SIM card enables a device to connect to a limited number of mobile networks. In contrast, a Multi-IMSI SIM card provides greater flexibility. It allows users to switch between different operators and access a broader range of networks. This solution, ideal for manufacturers deploying devices internationally or developing roaming applications, comes with several pre-loaded IMSIs.
In simpler terms, Multi-IMSI connectivity enables a device to automatically connect to the best available mobile network based on its geographical location.
How Does a Multi-IMSI SIM Card Work ?
Upon initial activation, the Multi-IMSI SIM card is loaded with a startup IMSI and roaming rules. These rules take into account the visited country, the visited public mobile network (VPLMN), and applicable rates. Based on these criteria, the card selects an operational IMSI from a set provided by the operator via the global SIM platform.
In practice, when the Multi-IMSI SIM card connects to a new foreign network, the device sends a notification through the home operator’s HLR/HSS register. Subsequently, an appropriate operational IMSI is chosen from the available pool and sent to the SIM card via SMS using OTA (Over-The-Air) technology. Once the SMS delivery is confirmed, the operational IMSI becomes active, and the Multi-IMSI SIM card is ready to access data.
Advantages of Using a Multi-IMSI SIM Card
Multi-IMSI SIM cards offer numerous advantages over traditional SIM cards. They are more flexible and better suited to your connectivity needs, whether you’re traveling abroad or staying within your own country. Here are the key benefits of this technology:
- Extended Network Coverage: Forget about dead zones and limited plans! With a Multi-IMSI SIM card, you’re not tied to a single operator. It automatically connects to the best available network based on your location, ensuring optimal coverage.
- Optimized Local Roaming: Traditional SIM cards often restrict you to your operator’s network, even within your country. A Multi-IMSI SIM card allows you to access other local networks, which may offer better performance or more competitive rates.
- Better Domestic and International Rates: Enjoy more economical plans, whether at home or abroad. The Multi-IMSI SIM card automatically selects the operator offering the best value based on your geographic location.
- Simplified Compliance: Thanks to direct partnerships with local operators, the Multi-IMSI SIM card bypasses the limitations of traditional roaming. This helps you avoid compliance issues related to taxes or data privacy regulations in certain countries.
- Simplified Updates and Enhanced Security: New IMSI profiles can be added remotely to your Multi-IMSI SIM card, eliminating the need for a physical replacement when changing operators. This flexibility also ensures enhanced security through regular software updates.
- Automatic Operation: The Multi-IMSI SIM card intelligently analyzes available networks and automatically switches to the most efficient or cost-effective option without requiring manual intervention.
- Ideal for IoT Applications: Multi-IMSI SIM cards are particularly valuable for various Internet of Things (IoT) sectors, such as medical telemonitoring, fleet tracking, or managing autonomous vehicles.
eUICC eSIM vs Multi-IMSI: What Are the Differences ?
The eUICC SIM (Embedded Universal Integrated Circuit Card) is an attractive alternative to the Multi-IMSI SIM card. The eUICC SIM typically consists of an embedded hardware component and eUICC software. This innovative technology enables remote management of operator profiles, allowing you to add, delete, or modify profiles without physically handling the SIM card.
Standardized by the GSMA, the eUICC ensures compatibility and interoperability with global mobile networks. It also enhances security by enabling seamless and secure switching between operators, making it an ideal option for devices requiring flexible and reliable connectivity.
Our HâpySIM Solution
Simplify cellular IoT connectivity with our latest M2M SIM card
Commonalities
Multi-IMSI and eUICC SIM cards share several similarities, particularly in managing subscriber authentication and connectivity. Both technologies enable the storage of multiple SIM profiles on a single card, allowing for automatic switching based on the best available signal or predefined criteria (cost, preferred network, etc.).
Differences Between eUICC and Multi-IMSI
Beyond their shared functionalities, here’s what distinguishes Multi-IMSI SIM cards from e-SIMs:
- Format: Multi-IMSI SIM cards are removable and fit into standard SIM card slots. e-SIMs, on the other hand, are often soldered directly onto the device’s motherboard (integrated e-SIM), although removable options are available.
- Mobile Network Operator (MNO): Multi-IMSI SIM cards are typically tied to a primary operator that manages the card. e-SIMs are not tied to a single operator, allowing IoT devices to switch providers without physical handling.
- Operator Flexibility: With Multi-IMSI SIM cards, the pre-loaded operator profiles cannot be changed once deployed. e-SIM technology allows remote downloading of new operator profiles, offering more control over network selection and management.
- Profile Management: Multi-IMSI SIM cards keep all profiles active, which is not always efficient. e-SIMs allow profiles to be activated or deactivated as needed, optimizing operational efficiency and connection costs.
- Cost Management: With Multi-IMSI SIM cards, you pay for all profiles, whether they are used or not. With e-SIMs, you only pay for the active profile. Additionally, Multi-IMSI SIM cards incur recurring fees for each active profile, while e-SIMs generally involve a one-time fee for profile activation.
- Security and Standardization: Multi-IMSI SIM cards lack standardization, which can pose security risks. e-SIMs, however, follow a GSMA-standardized solution, ensuring a higher level of security and interoperability between devices and networks worldwide.
Also Read: Permanent Roaming Solutions
eUICC and Multi-IMSI: Which One to Choose ?
The choice between eUICC and Multi-IMSI depends on your needs and priorities.
Choose Multi-IMSI if :
- Cost is a priority: Multi-IMSI automatically switches to the most economical network.
- Ease of use is essential: Multi-IMSI manages network selection automatically, without manual intervention.
- You prefer a proven technology: Multi-IMSI is a mature and reliable technology.
Choose eUICC if :
- Flexibility is crucial: eUICC allows remote management and modification of operator profiles.
- Device security is a priority: eUICC is embedded in the device, eliminating the risk of losing or damaging the SIM card.
- You manage a large fleet of IoT devices: eUICC simplifies the management of operator profiles for numerous devices spread over large geographic areas.
In summary, Multi-IMSI is an economical and easy-to-use solution, ideal for basic connectivity needs in limited geographic areas. eUICC is more versatile and secure, suited to the complex needs of businesses managing many IoT devices worldwide.
Conclusion : eUICC and Multi-IMSI
The rise of IoT and the growing connectivity of devices have made managing operator profiles a critical challenge for businesses. The choice between eUICC and Multi-IMSI depends on several factors, such as budget, flexibility, security, and the number of devices to manage.
Beyond technical aspects, it is important to consider the future evolution of your needs. eUICC, with its innovative and flexible technology, seems to be the solution of the future for businesses seeking optimal and scalable connectivity.
Ultimately, the best solution is the one that best meets your specific needs. Don’t hesitate to consult IoT connectivity experts to help you make the right choice and implement the most effective solution for your business.
