August 26 | By Amit Elimelech – edited and adapted for CommsCloud by Peter Walsh.
What Is an Embedded SIM?
An embedded SIM (eSIM or soldered SIM) is a SIM chip that’s built directly into a device’s motherboard, eliminating the need for a removable SIM card. Instead of being inserted manually, it’s integrated at the manufacturing stage, improving durability, saving space, and simplifying design.
Embedded SIMs are now common across smartphones, tablets, wearables, connected vehicles, and IoT devices, where long-term reliability and remote connectivity are essential.
It’s worth noting: while people often use embedded SIM and eSIM interchangeably, they aren’t quite the same.
Embedded SIM describes the form factor—a SIM that’s permanently built into the device.
eSIM (with eUICC) describes the capability—a SIM that supports remote provisioning, letting users switch carriers or profiles digitally, without replacing hardware.
Many embedded SIMs include eUICC functionality, but not all. Some are fixed to a single carrier and can’t be updated remotely.
How Embedded SIM Technology Works
An embedded SIM is a tiny microchip soldered onto a device’s motherboard. Functionally, it’s identical to a traditional SIM—it authenticates the device on mobile networks and stores subscriber data—but with a different physical design.
If an embedded SIM includes eUICC capabilities, carriers can remotely provision or update network profiles. This makes it ideal for connected ecosystems like smart cities, industrial IoT, and global enterprise deployments, where devices may be distributed across multiple networks and regions.
By removing the need for SIM trays and plastic cards, manufacturers gain more design freedom, allowing for thinner builds, improved water resistance, and larger batteries—all while maintaining secure, reliable connectivity.
Embedded SIM vs. eSIM: Key Differences
| Feature | Embedded SIM (without eUICC) | eSIM (with eUICC) |
|---|---|---|
| Physical Form | Soldered onto motherboard | Can be embedded or removable |
| Profile Management | One fixed mobile profile | Multiple profiles, remotely switchable |
| Remote Provisioning | Not supported | Fully supported |
| Typical Use Cases | Basic IoT, older consumer devices | Smartphones, enterprise IoT, automotive |
| Flexibility | Locked to one carrier | Global, multi-network ready |
In short: all eSIMs are embedded SIMs, but not all embedded SIMs are eSIMs.
Embedded SIM vs. Traditional SIM Cards
Both technologies connect devices to mobile networks, but their designs differ fundamentally.
Traditional SIM cards are removable. Embedded SIMs are permanently built in.
Here’s how they compare:
Space and durability: Embedded SIMs free up physical space and remove mechanical points of failure.
Security: Embedded SIMs can’t be easily removed or cloned.
Device management: Remote provisioning enables over-the-air updates for thousands of devices.
Compatibility: While nearly all carriers support physical SIMs, eSIM and embedded SIM adoption is still expanding globally.
Pros and Cons of Embedded SIMs
Advantages
Space-saving design: Enables sleeker devices with better battery and waterproofing.
Enhanced security: Non-removable SIMs reduce theft and tampering risks.
Greater durability: Resistant to dust, water, and physical wear.
Efficient management: Streamlines device onboarding and carrier changes for IoT fleets.
Limitations
Carrier lock-in: Some embedded SIMs can’t switch profiles.
No quick swapping: Requires software provisioning instead of manual replacement.
Compatibility gaps: Not all devices—or regions—fully support eUICC provisioning yet.
Devices That Support Embedded SIMs
The technology is now standard across many device categories:
Smartphones: Apple, Samsung, and Google flagship models
Tablets: iPad Pro, Galaxy Tab
Wearables: Apple Watch, Galaxy Watch
Laptops: Surface, HP, Lenovo
IoT & Automotive: Connected cars, industrial sensors, fleet systems
As carrier support expands, embedded SIMs will become the default choice for most connected devices.
The Next Step: iSIM (Integrated SIM)
iSIM represents the next evolution—embedding SIM functionality directly into the main processor or system-on-chip (SoC).
| Feature | Embedded SIM | iSIM |
|---|---|---|
| Placement | Soldered on motherboard | Built into processor |
| Space Efficiency | Eliminates SIM tray | Even smaller footprint |
| Power Use | Separate power management | More efficient |
| Security | High | Enhanced (hardware-level) |
| Adoption | Mainstream | Emerging (especially in IoT) |
Benefits of iSIMs include improved energy efficiency, reduced production costs, and stronger tamper resistance. However, widespread carrier and device support are still developing.
4 Best Practices for Implementing Embedded SIM Technology
1. Optimize Device Design
Eliminate the SIM tray to save space for improved thermal management, waterproofing, and antenna performance.
2. Use for IoT and Enterprise Deployments
Leverage eUICC to simplify remote provisioning, support multi-carrier access, and reduce downtime for distributed IoT networks.
3. Manage Multiple Profiles Effectively
For devices supporting multiple carrier profiles, integrate the Local Profile Assistant (LPA) to handle installation and activation securely.
4. Ensure Compliance and Security
Adhere to GSMA eSIM specifications and regional telecom regulations. Use encryption and authentication to protect devices from unauthorized access.
Managing Embedded SIMs at Scale
Platforms like floLIVE’s Connectivity Management Platform (CMP) integrate eUICC services directly, offering centralized provisioning for both M2M and Consumer eSIMs. Their globally distributed, GSMA-accredited data centers (Austin and London) ensure secure, scalable, and compliant connectivity management for enterprise and IoT deployments.
Key Benefits
Reduces production and logistics costs
Enables high-data applications and multi-region use
Simplifies activation (QR or remote)
Supports profile transfers and automated provisioning
For organizations managing large fleets of connected devices, this unified approach streamlines operations and improves agility.
Final Thoughts
Embedded SIMs—and their successors, eSIMs and iSIMs—are transforming how devices connect to networks. By removing physical barriers and enabling global, digital connectivity, they pave the way for smarter, more scalable connected ecosystems.