IDK who this is, but they were already on my call blocker so they have bothered me several times before.  Here is reverse lookup info that is available for free.  Supposedly a cell number.

Search Date:    Tuesday, July 24, 2012 10:20 AM
Phone Number:    914-442-0865
Line Type:    Paging / Messaging
Phone Carrier:    USA Mobility Wireless Inc
City:    WESTCHESTER
State:    NY
County:    Westchester
Latitude:    40.9467
Longitude:    -73.8737
Owner information for cell phones is NOT public record, and therefore costs money.