I deal with 3 schools and everyone of them withhold their numbers. If I am working, driving or shopping unless it's important or I know who is calling I will leave it til later
Why?? Do they have something to hide, do they use the phone to play prank calls?
And then they never leave a message and when finally get hold of me, say how hard I am to track down!
No, come up on my phone who you are and I will answer or phone you back when it's convenient