If I don't recognize the number on the display it's" Hullo ", but a withheld number is normally a cold caller so one of us will answer and wind them up . It nearly backfired when a bank rang and I was a bit offhand , as it was good news as Mr Too was in the money !!!!!!!!!!! We have the TPS but still get unsolicited calls .
Years ago I used to answer by stating my phone number, now I just say 'hello'. I was informed that it was safer to not state your number when replying for personal safety reasons and to protect your property. I cannot see for the life of me now why this might be so. I would welcome a knowledgeable answer on this as I think 'Hello' is a dreadful way to answer a phone.