The term eSIM is ambiguous - it can refer to a special SIM form factor (MFF2) that is smaller than a nano SIM card or eSIM can refer to the capability to update a SIM card in the field. While this article talks mainly about the difference in the form factors, please feel free to check for what is an eSIM article that is focused on the technology that allows to update SIMs in any form factor over-the-air.
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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.
What is an eUICC and Why Does It Matter?
Instead of changing out SIM cards or installing different cards for different deployments, an eUICC gives consumers and IoT manufacturers the ability to provision the SIM with a new operator profile OTA.
What Is 5G? Everything You Need to Know
5G networks are vastly improving high-speed Internet connectivity around the globe and opening the door to a revolution in the Internet of Things (IoT). There are already billions of IoT devices, but the wider bandwidth and more efficient spectrum usage of 5G networks will allow far more devices to operate in close proximity without interfering with one another.