Is UICC able to store multiple USIM communication profiles?

[chaholic]

I heard that USIM profiles could be considered as JavaCard applications. But I am not sure whether I can use UICC to store multiple USIM communication profiles. If it's possible, what is theory details?

[horse dream]

USIM profiles can be considered as Javacard "applications" and be downloaded, installed or deleted as the device owner decides to switch mobile operator. All this operations can be implemented using the GlobalPlatform security architecture.
Moreover, in order to load a USIM into your UICC you would need the MNO's cooperation.