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eSIM (embedded SIM) is a digital version of the traditional physical SIM card that is built directly into a device, such as a smartphone, tablet, smartwatch, or laptop. Unlike a removable SIM card, an eSIM is reprogrammable and allows users to activate a mobile plan, switch carriers, or manage multiple profiles without physically swapping cards. It simplifies connectivity, especially for travelers and dual-SIM users, and saves space inside devices—enabling sleeker designs and improved waterproofing. eSIM technology is supported by many modern devices and is increasingly being adopted as a global standard for mobile connectivity.
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