Question: What is the expected behavior of a User Equipment (UE) when its 'soft' switch-off is activated, according to 3GPP service principles?
Option 1: The UE immediately powers off without terminating any ongoing activities.
Option 2: The UE completes termination of current calls, detaches (if applicable), and stores necessary data in the SIM/USIM before powering off.
Option 3: The UE only terminates current calls but does not perform detach or store data in the SIM/USIM before switching off.
Option 4: The UE enters a low-power mode instead of completely powering off to conserve battery.
Explanation: This correct answer reflects the 'soft' switch-off procedure's intent, ensuring orderly termination of ongoing activities (like calls), appropriate network detachment, and securing of essential data on the SIM/USIM before shutdown. This approach maintains service integrity and user data consistency upon restart.