Question: What triggers the UICC (Universal Integrated Circuit Card) to send the next polling message to a remote server for checking updates?
Option 1: Receipt of a new SMS (Short Message Service) from the network
Option 2: Expiration of a timer set by the UICC's internal clock
Option 3: Arrival of a new mobile-terminated call
Option 4: Response to a TIMER MANAGEMENT command with an appropriate value
Explanation: According to the described behavior, the UICC utilizes a TIMER MANAGEMENT command with a specific value. This command is used to inform the UICC when it should send the next polling message, effectively making the response to this command the trigger for sending subsequent polling messages. This approach ensures synchronized and timely updates without relying on other network events or internal clock expirations alone.