MFF2 embedded SIM card: what it is and how it works within IoT

The MFF2 embedded SIM card is a type of SIM card that is soldered directly onto a device. Unlike traditional SIM cards, the MFF2 is not removable and is designed for long-term use in industrial and IoT applications.

Within IoT and connectivity, the MFF2 embedded SIM card is widely used due to its reliability, compact form factor, and suitability for extreme conditions.

Summary

An MFF2 embedded SIM card is a permanently soldered SIM card used for durable and robust connectivity in IoT devices.

Important to remember:

• the MFF2 SIM card is soldered directly onto the device
• it is not removable like traditional SIM cards
• it is suitable for industrial environments
• it supports eSIM (eUICC) functionality
• it is widely used in IoT deployments

What an MFF2 embedded SIM card exactly is

MFF2 stands for Machine Form Factor 2 and refers to the physical form of the SIM card. It is a small chip that is placed on the printed circuit board of a device during manufacturing.

The MFF2 SIM card can support both traditional SIM functionality and eSIM (eUICC). In the latter case, profiles can be managed remotely via remote SIM provisioning.

Due to its fixed integration, the MFF2 SIM card is better protected against physical damage and tampering.

How an MFF2 SIM card works

The operation of an MFF2 SIM card is similar to that of a traditional SIM card, but without physical interaction.

The basic operation:

• the MFF2 SIM card is integrated into the device during manufacturing
• the device uses the SIM card for network identification
• a connection is established with a mobile network
• data is sent and received via the network
• with eSIM, a profile can be managed or changed remotely

This makes it possible to manage devices fully remotely.

Difference between MFF2 and traditional SIM card

There are clear differences between MFF2 and removable SIM cards.

MFF2 embedded SIM card:

• permanently soldered onto the device
• resistant to vibrations and temperature changes
• no physical access required or possible
• suitable for long-term use

Traditional SIM card:

• removable
• more sensitive to wear or disconnection
• requires physical access

MFF2 is therefore better suited for industrial applications.

MFF2 and eSIM (eUICC)

Many MFF2 SIM cards support eSIM functionality via eUICC. This means that profiles can be downloaded, activated, or changed remotely.

Advantages of this include:

• no physical SIM swaps required
• flexibility in network selection
• suitable for international deployments
• remote lifecycle management

This makes the combination of MFF2 and eSIM particularly powerful in IoT.

Applications within IoT

MFF2 embedded SIM cards are used in situations where reliability and durability are critical.

Examples:

• asset tracking devices
• industrial gateways
• smart meters
• automotive applications
• medical devices
• routers and modems

In these applications, physical access is often limited or impossible.

Implementation of MFF2 in IoT solutions

When using MFF2 embedded SIM cards, there are several important implementation considerations.

Integration in hardware

The MFF2 SIM card is soldered onto the printed circuit board during manufacturing. This means that the choice for MFF2 must be made early in the device design.

Choice of eSIM or traditional profile

Depending on the application, a choice can be made between:

• traditional SIM functionality (fixed profile)
• eSIM (eUICC) with remote provisioning

For IoT deployments at scale or with international coverage, eSIM is often preferred.

Connectivity strategy

Determine in advance which networks and providers will be used, and how switching or fallback is configured.

Lifecycle management

Because physical replacement is not possible, management must be fully remote, including:

• profile management
• updates
• monitoring

Advantages of MFF2 embedded SIM cards

MFF2 offers several advantages for IoT applications.

Robustness

Resistant to extreme conditions such as temperature, humidity, and vibration.

Compact design

No SIM card slot required, saving space in the device.

Reliability

No moving or loose parts that can fail.

Security

Less sensitive to physical tampering or removal.

Points of attention for MFF2

Although MFF2 offers many advantages, there are also considerations.

No physical replacement

A defective SIM card cannot be easily replaced.

Design dependency

The choice for MFF2 must be made early in the hardware design.

Management complexity

Remote management and provisioning must be properly implemented.

Why MFF2 is important within IoT

IoT devices are increasingly deployed in environments where reliability and long lifespan are essential. MFF2 plays an important role by:

• reducing physical vulnerability
• enabling remote management
• being suitable for industrial applications
• allowing integration with eSIM

As a result, MFF2 has become a standard choice for many IoT deployments.

Conclusion

The MFF2 embedded SIM card is a robust and compact solution for mobile connectivity in IoT devices. Due to its fixed integration and support for eSIM, it offers flexibility and reliability for large-scale and long-term deployments.

For organizations working with connected devices, MFF2 is an important building block for stable and future-proof connectivity.

For more information, please contact us via phone at +31-85-0443500 or by email at info@thingsdata.com.