Question: What is the primary purpose of the EFGPI (Group ID) in the context of cellular systems, as defined in telecom standards?
Option 1: To uniquely identify each individual User Equipment (UE) within a network
Option 2: To determine if a mobile station is within its home system's local control area for enabling/disabling Local Control status
Option 3: To authenticate subscribers across different cellular networks globally
Option 4: To prioritize traffic for emergency services within a cellular network
Explanation: The EFGPI (Group ID) is utilized to identify a group of cellular systems, enabling the mobile station to verify if it is within its home system's local control area by matching the Group ID with the System Identification (SID) received over the air. This comparison directly influences the enablement or disablement of the Local Control status on the mobile station, highlighting its role in geographical-based service management rather than individual UE identification, global authentication, or traffic prioritization.