Question: What is a key requirement for the 3GPP system when a Disaster Condition is triggered and no other PLMN (Public Land Mobile Network) is available except those in a UE's (User Equipment) forbidden PLMN list?
Option 1: The 3GPP system must block access to all PLMNs to prevent overload.
Option 2: The 3GPP system should enable the UE to access PLMNs in the forbidden list as a temporary measure.
Option 3: The UE must perform an immediate handover to a non-3GPP network.
Option 4: All UEs in the affected area are automatically disconnected.
Explanation: In the context of Disaster Roaming, the primary goal is to ensure connectivity even under extraordinary circumstances. When no other PLMN is available except those previously forbidden, the system's ability to temporarily allow access to these networks is crucial for maintaining communication services during disasters. This approach prioritizes emergency connectivity over standard roaming restrictions, thereby supporting public safety and emergency response efforts.