All my previous jobs had me working weekends - the only reason I got called on my days off is when somebody called in and the manager needed warm bodies. This is pretty typical of service-oriented jobs. And what, I believe, Caller ID was really invented for.
Only if there is an event planned for early Monday morning (which is very rare). I only work 4 days a week but it is very common for me to get calls on a Wednesday (my day off)