For all the unknown numbers on the phone. . .
I have gotten to the point of answering them as follows, using my best southern, excited, friendly, fast talking voice I can get. . .
"Bob's Scrap Metal! Dis here's Bob! Your crap is our scrap, Our scrap is your crap.
When kin we can get it?
Dis here's Bob!!
Then just wait. Usually there is a dial tone and no return calls.