However, the most effective one I have had so far can be used only one day per year:

However, the most effective one I have had so far can be used only one day
per year: "This is David. I'm not using the phone over Yom Kippur, so please
leave a message or call back after the holiday." No one wants to admit not
having realized it was Yom Kippur or not knowing I would pick one holiday from
the whole calendar on which to get observant, so everyone hangs up and leaves
me no bad news or requests for favors.

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