that just lets them know there is someone at that number if you call them back

As others said received a call saying that bing yahoo and google been trying to reach me to update my business listing. I received numerous calls about this. I don't own a business.

Called me 3 times last week, I know their usually a scammer, called them back to play a joke on them. Finally got thru to a female card service rep. Told her I was stroking my big [***] thinking of sticking it in her [***] all day, and having her suck me off..she stayed on line for about 20 secs, said I was sick, haven't received any calls since!

They just called me.  I didn't answer (and they didn't leave a message.)

They called my cell, I did not answer, they left no message.
I get a few calls each week from scammers - looks like another one.
Now blocked on my cell.

Go to www.endrobocalls.org and sign the petition.  It is run by the Consumer Reports Magazine folks, and they are pressuring the Feds and phone companies to stop this nonsense.  Spread the word !