this call I answered is ( breast cancer research ) or so they say. what happens with many of calls something like this is hooked up to a huge network call center.so often these #'s cannot be called back to verity who they are. they are someone looking for money, or want to know who you are ( maybe you owe them money) or maybe they are collection co. of a debt. they will ask ( your name) if this is you (DO NOT ANSWER) just say politely ( or then they keep call to get back to get back at you) please do not call again. that is it. than hang up politely.