The caller tried to portray itself as "PRIVATE", but my high-tech Android phone revealed the caller's phone number. When I later called this number back, I got a pre-recorded message, in which the message was that I could continue to listen to a business proposition in which this guy-supposedly the one in the recorded message--would help advance one's business. HOWEVER, just for merely listening to this prerecorded message, I could expect to get charged. I hung up as fast as I could!! I do believe that charging for listening to such an introduction is illegal; and if I get a bill, I will bring it to the attention of my Attorney General.