Calling ahead is VERY important! Here are the following reasons why:
- You may have to go out at the moment and then you get a surprise visit which create a friction in your plans.
- You maybe in the middle of sex or a movie, video games and suddenly someone shows up and takes your momentum away.
- You maybe having a horrible day and if you don't get the call, you wont be able to calm yourself because you get surprised.
Now, if someone gives you a notice, then that means that, you can create a timetable for that person and they wont be intruding in the middle of your other activities.
I mean, ask your self this, do you want a job that has employers call you at ANY moment of the day and asking you if you can take the shift? Or, do you prefer a job that allows you to anticipate the time and the day in which you have to show up?