I received a call from this unfamiliar number this morning and I did not answer it for I felt like it was a scam as this number is not one that I recognize.
This is a documented scammer (http://www.antiscammers.org/nadine-salter-scammer-2011-volvo-xc60/) who tried to sell me a car on craigslist. Do no communicate with them!
The number called I answered, a short pause, then the call hung up, I called back and it said the subscriber is unavailable.
It's probably a fake number that someone got offline.