Question: What is the implication for the presence of EFVGCSS (Voice Group Call Service Status) in a User Equipment (UE) if service n°57 is indicated as 'available'?
Option 1: The file may be present but its contents are irrelevant.
Option 2: The presence of EFVGCSS is not mandated; it's optional.
Option 3: This file shall be present and directly related to the EFVGCS, indicating activation status for specific VGCS group identifiers.
Option 4: The UE will automatically allocate a new service number if EFVGCSS is not found.
Explanation: If service n°57 is 'available', the EFVGCSS file must be present in the User Equipment (UE), indicating activation status for specific Voice Group Call Service (VGCS) group identifiers, ensuring conformance with telecom standards for managing voice group call services.