Question: In a scenario where multiple USIMs (Universal Subscriber Identity Module) are stored on a single UICC (Universal Integrated Circuit Card), what is the default behavior at switch-on if there is no Last Active USIM defined in the UICC?
Option 1: The UE (User Equipment) will automatically select the first USIM application it detects on the UICC.
Option 2: The user is prompted to manually select an active USIM amongst those available on the UICC.
Option 3: The UE will enter a restricted mode, requiring a network operator’s intervention to activate a USIM.
Option 4: All USIMs on the UICC are simultaneously activated in a shared capacity.
Explanation: According to the specified behavior for multiple USIMs per UICC, if there is no Last Active USIM defined (stored) on the UICC at switch-on, the default action allows the user to select the active USIM from amongst those available on the UICC. This ensures flexibility and user control in a multi-USIM environment, particularly when those USIMs are associated with different home environments.