eSIM for Industrial IoT Explained

1. Enhanced Reliability: A Structural Upgrade for Stable Connections

Since its adoption in mobile communications in the 1990s, the SIM card has undergone a significant reduction in physical size—from the full-size credit-card-like format, through Mini, Micro, to the current Nano SIM. After repeated "slimming down," only the core metal chip remains, with the plastic frame now paper-thin.

However, the core logic of the SIM card has remained unchanged: it is a removable physical card, requiring manual involvement for activation, number changes, and network switching.

When the connected objects are no longer just phones, but a rapidly growing number of smart devices spread across diverse locations with longer lifecycles, this physical dependency becomes a connectivity bottleneck. In outdoor, underground, or in-vehicle environments, replacing a card is costly, while roaming fees and coverage blind spots become increasingly problematic.

Core Conclusion: SIMs became smaller, but they didn't become more flexible.

02 What is eSIM? Turning Communication Identity from a "Card" into a "Capability"

If a traditional SIM is like a physical key, an eSIM is like an electronic key system built into the device – you can be authorized to "unlock" it anytime without carrying a physical key.

eSIM (Embedded-SIM) is an embedded secure chip that integrates the functionality of a traditional SIM card directly onto a device's motherboard, typically soldered in place. It no longer relies on a physical card slot. Instead, it uses GSMA-standardized Remote SIM Provisioning (OTA, Over-The-Air) technology to download, install, and activate operator profiles.

For individual users: You can manage numbers and plans online without touching the card slot or visiting a service center.

For device managers: Eliminates the pressure of logistics and on-site maintenance for card insertion; large-scale deployments can be brought online and managed uniformly.

03 Core Advantages of eSIM: More Than Convenience – A Structural Shift

1. Enhanced Reliability: A Structural Upgrade for Stable Connections

Eliminating the card slot and its gaps improves a device's resistance to water and dust, and prevents poor contact caused by drops or vibration.

For IoT devices deployed in challenging environments like outdoors, underground, or in vehicles, this translates to greater environmental adaptability, fewer maintenance visits, and increased online uptime.

2. More Flexible Connectivity Strategies: Identity No Longer Tied to a Card

eSIM supports operator switching via remote configuration. Vehicles in logistics or engineering can automatically switch operators based on signal quality when crossing provinces, reducing coverage gaps.

Devices gain the true ability to connect flexibly across networks and geographical boundaries.

3. Lower Operational Costs: Network Policies Can Be Managed Remotely

Previously, configuration, card changes, and upgrades required "a person on-site," which is time-consuming and disrupts business continuity.

Now, with eSIM, devices can be configured and managed in bulk remotely. Hundreds or even thousands of terminals in locations like malls, hospitals, and tourist sites can be activated and adjusted centrally, ensuring that network policy updates keep pace with business expansion.

4. Extended Lifecycle: Reducing the Impact of Network Evolution on Devices

From 3G to 4G and now 5G, physical SIMs often need replacement with network upgrades, and devices can become obsolete due to incompatible communication configurations.

eSIM allows a terminal's network identity to be updated continuously – without disassembly, service interruption, or network disconnection – ensuring long-term usability across network generations and extending the device's overall lifecycle.

5. Enhanced Security: Building Protection from the Chip Level

Physical cards risk loss, theft, or cloning. In contrast, eSIM hardens the root of trust within a secure hardware area.

For enterprise terminals, communication channels and permissions can be continuously updated and risk-controlled. Security no longer depends on a single encryption or physical safeguard, but is ensured through a systematic approach of continuous verification and policy updates.

04 From Individuals to IoT: How eSIM Is Changing the Connectivity Experience

Consumer Sector

Smartwatches were among the first consumer devices to see large-scale eSIM adoption. Starting in 2018, China's three major operators rolled out the "One Number, Two Terminals" service, allowing watches to connect independently to cellular networks without being tethered to a phone.

Today, eSIM is widely integrated into high-end smartwatches and is rapidly expanding into niche markets like children's watches and senior health monitoring devices. Globally, over 200 countries and regions now offer eSIM services for smartphones, enabling users to easily keep local and international numbers online simultaneously and switch between them seamlessly.

Industrial IoT Sector

eSIM's true potential lies in the Internet of Things (IoT) domain.

Under the traditional SIM model, once an IoT device is deployed in a remote or harsh environment (e.g., water/electricity meters, in-vehicle systems, agricultural sensors), replacing the SIM card is often impractical. eSIM's remote provisioning capability allows operator switching, plan changes, and fault recovery to be performed entirely from the backend, significantly reducing maintenance costs.

By 2030, it is estimated that over two billion IoT devices globally will be equipped with eSIM technology.

The GSMA's new IoT eSIM specification (SGP.32) , released in 2023, introduces three key technical innovations tailored for IoT scenarios:

05 Steady Progress in China: From IoT to Smartphones

China's eSIM deployment is proceeding at a measured pace. The country enforces strict real-name registration for telecommunications, with high requirements for device identity trust, data security, and platform collaboration – every step must be built on a controllable foundation.

In 2025, China Unicom, China Mobile, and China Telecom officially received approval from the Ministry of Industry and Information Technology (MIIT) for commercial trials of eSIM for smartphones. This marks the official entry of eSIM technology into commercial trials for handsets, expanding beyond the IoT and wearables sectors.

Prior to this, eSIM had already completed large-scale commercial validation in the wearables market, providing valuable experience for wider adoption.

06 eSIM in MovingComm Products

As a manufacturer of industrial wireless communication equipment, MovingComm has integrated eSIM support into several product lines:

Integrating eSIM enhances MovingComm industrial routers in the following key areas:

• Simplified Deployment: eSIM profiles can be pre-loaded at the factory, enabling devices to connect automatically upon power-on, eliminating on-site card insertion.

• Link Redundancy: eSIM, combined with dual physical SIM slots, provides more operator options and switchover strategies.

• Global Adaptability: Supports remote switching of operator profiles, facilitating device export and cross-regional deployment.

• Long-term O&M: Network configurations can be adjusted remotely via the cloud management platform, reducing on-site maintenance.

07 Conclusion

The physical "slimming" journey of the SIM card – from full-size to Nano – has reached its end. eSIM opens a new evolutionary path: transforming connectivity identity from a "removable card" into a "programmable capability."

For Industrial IoT, eSIM addresses not just the "how to connect" question, but the systemic challenge of "how to keep hundreds of thousands of dispersed devices online stably over the long term."

With the rollout of the GSMA's new IoT eSIM specification and the formal entry of domestic operators, eSIM is becoming the "new key" for industrial devices to connect to the digital world – from smart meters and construction vehicles to self-service terminals and global logistics.

MovingComm will continue to advance the adoption of eSIM technology across its industrial routers, CPEs, and other products, providing industry customers with more flexible, reliable, and easily maintainable networking solutions.