# eUICC Centre

The ConnectedYou SIM is built using standard & industry approved eUICC functionality to manage Connectivity Providers on the SIM with GSMA endorsed security guidelines. This GSMA eco-system of Subscription Management, called “Remote SIM Provisioning” system is used to manage these eUICCs. Refer to [here](https://docs.connectedyou.io/knowledge-base/v/sim-esims/connectedyou-sim/euicc-functionality) for more details. 

eUICCs allows the user to retain control of the physical SIM via the ability to switch the Connectivity Provider at will.

There are 2 types of eUICCs enabled via the ConnectedYou platform: Cloud eUICCs and SAS eUICCs which correspond to the RSP platforms they communciate with (Cloud & SAS).

### Cloud RSP platform

### SAS RSP platform