iSIM vs eSIM vs SIM: The constantly shrinking ways carriers ID your phone

The death of physical SIM cards is quickly approaching. These are the alternatives.

Every month, you pay a bill for cell phone service. Somehow, that access needs to make it to your device. The SIM card, or “subscriber identity module,” connects your phone with your phone bill.

While you might expect authentication to happen over a network with a simple username and password, cell phones predate the Internet, so SIM cards can seem a little old-fashioned. Still, the industry is trying to modernize itself while maintaining backward compatibility with older devices, and that has led to the rise of many different SIM card formats. The newest is iSIM, the latest advancement in a never-ending quest to save space in your smartphone.

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