Question: For an ISIM-enabled Mobile Equipment (ME) that supports Communication Control for IMS by USIM, what is the implication if the 'ISIM Service n°9' is marked as 'available'?
Option 1: The ME is not required to perform Communication Control procedures for IMS.
Option 2: The ME must perform Communication Control procedures for IMS if it indicated support in the TERMINAL PROFILE command.
Option 3: The ISIM Service n°9 availability overrides any previously set TERMINAL PROFILE commands related to USIM.
Option 4: The ME will automatically switch to use USIM for IMS communication control.
Explanation: According to the specifications, if an ME indicates support for Communication Control for IMS by USIM in the TERMINAL PROFILE command, it is mandatory for the ME to perform these procedures when ISIM Service n°9 is available. This ensures consistency and functionality across services utilizing IMS communication control, leveraging either USIM or ISIM, based on their availability and the device's declared capabilities.