Quick definition: A SIM, or Subscriber Identity Module, is a small memory chip that is either inserted into or built into a device, providing it with the ability to connect to a cellular network. SIM cards, which can be non-updatable UICCs or updatable eUICCs (commonly known as eSIMs), are available in various form factors and types, such as standard SIMs, eSIMs, and iSIMs.
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SIM, eSIM vs iSIM: What’s the Difference?
As you explore cellular components, at times you may hear several different terms for components that provide the same core function, such as a SIM, eSIM, and iSIM. The difference between these components could have a significant impact on your device’s future functionality, security, and scalability, so it’s important to understand the differences between them.
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).