Originally Posted by
USMC3197
Rule #2 of being an airline pilot: NEVER ANSWER THE PHONE ON YOUR DUTY DAYS UNTIL YOU ARE ON DUTY!
Usually true, but it can cut both ways...
If they call you early AM before you duty on, it might be for a trip that starts early...which could get you done early (nice if it's your last day).
Or they could tell you to duty off for 8 hours so they can give a later show with an even later finish...long after your normal bedtime.