We have caller display on our phones but quite a few of the people we want to talk to choose to withhold their numbers too. Among the people who have withheld numbers are my mum's home, my mum's 80 year old friend, my brother, my ex Sil who is currently having problems, her daughter (who is one of her problems) but, so far today, I have answered 8 cold callers with 'number withheld" on the screen! 

Ethical question - how do you feel about second chance??

It's my phone, I like my privacy but if other people choose to hide their identities I don't see why they should expect me to answer and get a cold-caller. I'm convinced my blood pressure has dropped a whole load simply because I am capable of ignoring the phone.
