Question: What happens to a Mobile Equipment (ME) when the inserted SIM/USIM's IMSI does not match any of the stored SIM/USIM code groups during the personalisation check?
Option 1: The ME automatically attempts to update its stored SIM/USIM code groups to include the new IMSI.
Option 2: The ME enters a suspended mode, awaiting further instructions from the network before proceeding.
Option 3: The ME displays an error message (e.g., "Insert correct SIM" or "Insert correct USIM") and restricts functionality to emergency calls only.
Option 4: The ME ignores the mismatch and proceeds with normal operation, assuming the SIM/USIM is valid for all services.
Explanation: This outcome is a direct consequence of the SIM/USIM personalisation check failing due to an IMSI mismatch. To prevent unauthorized or incorrect SIM/USIM usage, the ME prioritizes security and usability by alerting the user and limiting functionality to emergency services only, as per the described protocol for handling such discrepancies in mobile equipment operation.