eSIM vs Reality: Bridging the Gap in IoT Connectivity

IoT and M2M stakeholders are witnessing a surge in ambition around the Embedded Universal Integrated Circuit Card, commonly known as the eUICC or eSIM. A 2017 IHS Markit study projected a jump from 109 million eSIM shipments in 2016 to nearly 1 billion by 2021, driven largely by the expanding IoT ecosystem. According to Ian Marsden, CTO of Eseye, eSIMs will be pivotal in keeping billions of connected devices online worldwide.

The automotive sector exemplifies this momentum. As connected cars become mainstream, eUICC‑compliant eSIMs can simplify logistics and reduce costs for manufacturers, offering a streamlined path to global deployment.

Industry leaders are positioning the eSIM as the next evolution of the SIM card, and operators, vendors and service providers are piloting eSIM‑based edge solutions to capture a share of the growing cellular, IoT and device‑connectivity market.

Perception: The Promise of eSIM

Proponents highlight the most compelling advantage of eSIM technology: over‑the‑air provisioning. Traditional SIM cards lock a device to a single MNO profile, requiring physical replacement whenever a customer changes operators. For personal mobile phones this is manageable, but for enterprises managing thousands or millions of remote edge devices the cost and logistical burden is significant.

eUICC‑compliant eSIMs allow devices to host multiple, changeable provider profiles immediately after manufacturing. This enables operators to be swapped on demand, driven by factors such as coverage, resilience, SLA quality or data rates, and it can be done without physical access to the device.

For enterprises, this translates into reduced TCO, improved uptime, and the ability to select the optimal local network on the fly. Manufacturers benefit from a ready‑to‑ship product that eliminates post‑manufacturing configuration, while operators gain a competitive edge by offering greater flexibility.

The Gap to eUICC Delivery

Despite the excitement, the current eUICC specification does not yet resolve all IoT challenges. Commercial and technical hurdles persist, and they must be addressed in the coming months to unlock widespread adoption.

Commercial Challenges

Operators recognize that eSIM’s avoidance of contractual lock‑in threatens the commoditisation of M2M cellular data. While customers value flexibility, operators must still enforce contractual procedures and manage the cost of delivering large volumes of critical data. Dynamic multi‑IMSI SIM technology and 24/7 IoT support can reduce TCO, but the underlying service costs remain.

Technical Challenges

Remote provisioning remains a significant integration hurdle. For a supplier change to occur, both parties must align their systems to enable seamless data flow, and the device itself must be able to communicate with both platforms. From years of experience in dynamic IMS routing and device optimisation, this process is often more complex and time‑consuming than initially expected.

While eSIM standards represent a step in the right direction, additional work is needed to realize the full potential of eUICC as a transformative IoT innovation.

The author of this blog is Ian Marsden, CTO at Eseye