Question: What triggers the update of the EFOCT (Outgoing Call Timer) file contents in a USIM application, according to 3GPP specifications?
Option 1: Upon receipt of a new incoming call
Option 2: When the user changes their phone settings
Option 3: During an ongoing call, every minute
Option 4: After a call is disconnected
Explanation: The correct answer is Option 4 because, as per the specifications, the contents of the EFOCT file are updated only after a call is disconnected. This ensures that the accumulated outgoing call timer duration value accurately reflects the total time spent on calls, updating the record once each call session is completed.