eSIM (Embedded SIM) is a digital version of a traditional SIM card that is built directly into a device, such as a smartphone, tablet, or smartwatch. Unlike physical SIM cards, eSIMs don’t need to be inserted or replaced — instead, users can activate or switch mobile carriers through software settings. This makes it more convenient, space-efficient, and environmentally friendly, while also enabling cheap international calls and easy access to local data plans when traveling abroad.
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