Quick definition: eUICC stands for Embedded Universal Integrated Circuit Card. It’s a component of a Subscriber Identity Module (SIM) card that lets you switch Mobile Network Operators (MNOs). This technology has been a game changer for cellular IoT because it simplifies global deployment and mobile machine-to-machine applications.
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What is an eSIM?
Traditionally, if you wanted to switch your cellular device's carrier you had to replace the SIM with one from the new carrier. With phones and tablets, this is a simple task. However, for thousands of remotely deployed IoT devices, swapping out SIMs is problematic, especially for devices with embedded SIM form factors that are soldered. In such cases, the SIM is stuck in the device.
SIM Form Factors Explained
The capabilities of each form factor are the same, but they each have different dimensions, which makes them more suitable for specific kinds of devices. 2FF, 3FF, and 4FF SIMs have to be inserted into a device, while MFF2 SIMs have to be embedded—which is why they’re also called eSIMs. (1FF SIMs are no longer in use.).
eSIM vs. Nano SIM Form Factors: What’s the Difference?
When choosing a SIM card for your cellular device, size matters. Smaller SIM cards take up less space, freeing manufacturers to build smaller devices and add additional components—which is especially valuable in Internet of Things (IoT) applications. Depending on how and where your device will be used, it may also be important to have a more durable SIM card that can handle extreme temperatures and conditions like corrosion and vibrations.