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All About eSIM Cards: What is eSIM, How does eSim Work, Setup, Plans & Activation Guide
Updated 8 October 2026; next review by 8 April 2027. What is an eSIM? An eSIM (embedded SIM, full form "embedded Subscriber Identity Module", also called an electronic SIM or eSIM card) is a SIM chip built into your phone, tablet or watch. Instead of inserting a plastic