This is a particularly nasty phone scam

in

Basically, they call and try and get you to say "yes" so that they can use that as proof that you agree to buy goods or services you did not.  They will ask you any sort of question, such as "Can you hear me?"  "Are you the homeowner?"  etc.  

Conclusion - don't answer the phone unless you recognize the number. 

http://patch.com/michigan/birmingham/s/g0j4c/can-you-hear-me-whatever-yo...