Phone Number Hunting and Cleanup

I have discovered a list of phone numbers on an old notepad at home. I dont recognise many of them and im intrigued as to who they are.

I'm going to call them all over the next few days and if I recognise the voice that answers I will say hello, otherwise i will just hang up. If I dont recongise the voice I will put a line through the number.

So far I am 5 numbers for none. Havent recognised the voice of ANYBODY, so I can only assume the numbers are ancient and the friends who did live there are long gone.