An eSIM, or embedded Subscriber Identity Module, is a digital alternative to the traditional physical SIM card. Instead of a removable plastic chip, the eSIM is a small, reprogrammable chip integrated directly into your device's hardware during manufacturing. It functions by digitally downloading and storing network profiles. This allows CoreESIM to provision a cellular plan to your device remotely, eliminating the need for physical card swapping and enabling instant activation of mobile data services for travelers globally.
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What is an eSIM, and how does this digital SIM function?
Updated April 22, 2026
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