James--Sales Engineer

Hey Adam, I noticed we're incorporating eUICC sim in our latest IoT project. Can you fill me in on what is eUICC and what it brings to the table?

Adam--Senior Product Manager

Sure, James. eUICC allows devices to switch between network carriers remotely without a physical SIM swap.

James--Sales Engineer

Without a SIM swap? Sounds interesting. Can you add more on how it is carried out? Or the technology ivnolved?

Adam--Senior Product Manager

Sure James. With the technologies like RSP and OTA, the profile updation and management of SIM profiles is easier and requires no manual intervention.

James--Sales Engineer

Does that mean it enables remote carrier profile switching for our IoT deployment, making it more flexible?

Adam--Senior Product Manager

Exactly the point. Manage and load SIM profiles into the IoT deployments remotely. To know more, go ahead and read this blog about eUICC.


IoT deployments worldwide have used conventional SIM cards for a long time from the early 2000s, when it was first used in the Automated Meter Reading (AMR) project in Texas. But, as IoT deployments grew, there arose many difficulties in IoT Connectivity enablements and management.

Conventional SIM cards are carrier-specific. Locked into a single carrier, it will require physical SIM swaps to switch between networks, which obviously seems like an impractical thing to do. A single network SIM could lead to significant connectivity blackouts, especially in the below mentioned two scenarios

Frequent human intervention and associated recurring costs to just maintain ‘Connectivity’ is not a smart proposition, and requires a technology upgrade/innovation to solve this problem. To address these shortcomings, the eUICC concept came into play.

Transitioning From UICC to eUICC


The transition from traditional UICC SIM cards to eUICC-enabled eSIMs

The UICC (Universal Integrated Circuit Card) is known as the mini-computer in the SIM ecosystem. It is a smart card technology that ensures the authentication and identification of SIM cards with designated MNOs.

What is eUICC?

eUICC or Embedded Universal Integrated Circuit Card is the architectural standard published by GSMA for eSIMs for establishing SIM capability. eUICC enables RSP (Remote SIM Provisioning) and OTA (Over-The-Air) updates for the SIM profiles, making it easier to

Architecture of eUICC- Explained

Architecture of eUICC

Architectural overview of the eUICC security in eSIM

With tech growth, eUICC capability is now available in removable SIM cards and eSIMs. The key elements constituting the eUICC architecture are:

eUICC remote provisioning components of an eSIM

eUICC remote provisioning components of an eSIM

The Subscription Manager (SM) of eUICC has two components:

SM-DP prepares and stores operator profiles, and installs them onto the eUICC. SM-SR manages profile status, enables/disables/or deletes profiles, and secures the link between eUICC and SM-DP during operator profile delivery.

Issuer Security Domain Root (ISD-R) is the in-build card component on SM-SR that manages SIM profiles. The ISD-P represents the UICC profiles. ECASD is also known as eUICC Controlling Authority Security Domain. It contains non-modifiable eUICC private keys, and root public keys for the establishment of new keysets in the ISD-P(s) and ISD-R. The Local Profile Assistant (LPA) component handles profile discovery, downloading profiles, and profile management.

Benefits of eUICC-Enabled eSIMs

Closing Notes

As the technology makes progress, there is more evolution occurring in this SIM field. The introduction of iUICC with iSIM invention is a topic in itself to discuss later on in the coming chapters. With xUICC ( eUICC & iUICC), it is evident that the connectivity issues in the M2M domain will be addressed to a great extent.

To learn more, visit us at https://www.cavliwireless.com/iot-modules/cellular-modules.html

Amusing Tech Chronicles

Facts and Anecdotes related to this edition of Wireless By Design

A Global Citizen Passport

A Global Citizen Passport

eUICC is the passport of IoT devices. They allow devices to 'travel' internationally without the hassle of 'visa applications' (carrier negotiations and contracts) for each country.

Go Green

Go Green

eUICC is environment-friendly. Fewer physical SIM cards mean less plastic waste, making a small but yet a significant green solution.

The Stamp Collector

The Stamp Collector

eUICC is a stamp collector gathering stamps from different (carrier) countries in the world of connectivity.

Go Beyond and Explore

An eSIM, or Embedded SIM, also known as MFF2 SIM card, is a SIM card that is embedded into the devices to provide a permanent network connection. eSIM is the combination of eSIM hardware, RSP platform, and eUICC architecture. eUICC is an architectural component that adheres to GSMA's specifications enabling remote SIM provisioning, OTA updates, and multiple carrier profile storage, without any physical SIM swap.

Consumer eSIM is typically used in mobile phones, tablets, laptops, and other consumer devices with user interfaces, where the user actively downloads the profile, often via a QR code. M2M eSIM, on the other hand, is designed for IoT sensors, utility meters, trackers, and devices that operate with minimal onsite human interaction, where the profile is remotely pushed to the device.

eSIMs are more power-efficient than traditional SIM cards, meaning they use less power and don't drain your battery as quickly when connecting to the wireless network. The factors that influence battery life in devices with eSIM include switching between networks, high data usage, and overall efficiency of the device.



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