I use them. In fact when I have an appointment it goes in my phone, the hubby's phone. We don't have a wall calender though.

this person actually just walked in and asked me what day it was...I was like ummm you just drove all the way here to ask me that?

wow, that is on a completely different level

I have a huge wall calendar in my office that my whole family uses, writes on, feels they own it lol.