My husband does this with his phone (not a number he uses for work). My parents do this as well and I can’t figure out if it’s due to lack of tech skills or not wanting to deal with voicemails (I think it’s a combination). I had surgery a couple years ago and had to give the hospital all three numbers and then my brother an hour away as backup since he’s the only one besides me with functional voicemail.
I used to work at a place where we would occasionally send reports of network misuse that sometimes included inappropriate images the user had stored on work devices. One person had an email system that was somehow set up to make any attached images the profile pic for that account. So she would end up with random pornographic images as the profile pic whenever she received reports from us. She said she had no idea how to change it and could we please help? Since she was not part of our company, and I have no idea how that could even happen, I just started sending her kitten pictures after every report that included an image. Problem solved.

No one should be calling during the holidays, and yet some people do. When you’re out for the holidays, create a voicemail greeting that communicates the cheerfulness of the season while still staying professional.
For immediate assistance, please contact my colleague [contact name] on [contact email/phone number] who should be able to help. Otherwise, I will respond to your email as soon as possible upon my return.