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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.).
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.