Question: When re-configuring a USIM from eCall only support to both eCall and Normal call support (or vice versa), how is the terminal notified of these changes, according to 3GPP specifications for USIM application management?
Option 1: Via SMS notification to the User Equipment (UE)
Option 2: Through a manual restart of the User Equipment (UE) by the user
Option 3: By updating the Local Policy on the Serving and Public Land Mobile Network (SPLMN)
Option 4: Using the REFRESH proactive command, specifically one of its defined modes (e.g., USIM Initialization, UICC Reset, etc.)
Explanation: The correct answer is Option 4 because, as per 3GPP specifications for managing changes in the USIM's service configuration, the terminal must be informed of these updates through standardized commands. The REFRESH proactive command, with its various modes, is designed for this purpose, ensuring the UE reflects the latest service configurations from the USIM without requiring user intervention or relying on less direct methods.