Unlisted is perfect for separating work and personal calls. I find it so convenient to have separate numbers. I no longer have to give out my personal number to clients and I always know which line is ringing.
I have a business and I don't like to give out my personal number, so I give them my Unlisted number. The best part is that I can get all of my calls on the same phone!
We used to use our own personal phones to call our students. They would save our numbers and call us at all hours. Thanks to Unlisted, we can give students and parents a separate number that still comes to me, but on my terms.