Who called from 3345305960

Caller ID said  BCOF, left no mesage.

When I placed the phone to my ear, all I heard was a loud, strange sound that hurt my ear. It wasn't the familiar "Fax machine" (digital handshake) sound, but a multi-frequency harsh sound that I've never heard before. (Much worse on the ears than the Fax machine sound...) I hung up real fast!

this number is for raising money for cancer.

Did not recognize the number.  Did not answer. Left no message.

Received calls from this number while away with no message left. Called number, received a tone then called was disconnected.