eUICC (embedded UICC[1]) refers to the architectural standards published by the GSM Association (GSMA)[2][3] or implementations of those standard for eSIM, a device used to securely store one or more SIM card profiles, which are the unique identifiers and cryptographic keys used by cellular network service providers to uniquely identify and securely connect to mobile network devices.
Applications of eUICC are found in mobile network devices (cell phones, tablets, portable computers, security controllers, medical devices, etc.)
The core standards that define eUICC are published by the GSM Association in two topical areas.
Core standards for implementing eSIM on mobile devices include the following articles:[2] GSMA publishes standards for machine-to-machine (M2M) third-party provisioning of eSIM which includes the following articles:[3] eUICC can refer to any implementation or application of the eUICC standards in an eSIM device.
Each implementation of eUICC includes software code, a processor to emulate the software, non-volatile memory used to store the unique identifiers and cryptographic keys that are part of a SIM profile, and a bus interface to communicate the SIM profile to the mobile device.