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eSIM (embedded SIM): A SIM technology embedded inside a device that allows users to change service providers through software configuration rather than physically swapping SIM cards.
eUICC (Embedded Universal Integrated Circuit Card): The heart of eSIM technology, it is a reprogrammable SIM card chip that allows service provider information to be changed remotely.
Remote SIM Provisioning: A service and protocol that allows users to activate and manage eSIM remotely without accessing the physical SIM card.
Activation Code: A set of codes used to activate eSIM service, usually by scanning a QR code, using an SM-DP+ address, or entering it through a mobile operator's app.
SM-DP+ (Subscription Manager Data Preparation Plus): A service responsible for preparing and managing subscription data on eSIM devices, allowing users to remotely download and install operator data.
SM-SR (Subscription Manager Secure Routing): A service responsible for securely transmitting data between eSIM and operators to ensure the security of data transmission.
Profile: Operator subscription information stored on eSIM, including user identity, service details and network authentication information.
OTA (Over-The-Air technology): A wireless transmission technology used to remotely update data packages or software on eSIM.