Cellular devices need specific hardware and software components to connect to cellular networks. These components allow the device to identify and attach to networks owned by specific carriers, enable the network to authenticate the device to ensure it has access (and what kind of access it has), and associate the device and its network usage with a specific account.
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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.
What Is an Integrated SIM (iSIM)?
Smaller components allow manufacturers to build smaller devices. The integrated SIM gives manufacturers the greatest flexibility in how they design cellular devices. In the future, iSIMs will be a dominant SIM form factor in consumer electronics and the Internet of Things (IoT).
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.