I got a call from 239-141-8850 on January 6, 2017 at 6:17 pm.  The caller did not leave a message even though my answering machine was on.  My caller ID said, "Invalid Number."  Now, who would use 'invalid number' for an ID?   Not any business I know of.  Don't all legitimate businesses use their real name for their caller ID?  I would think so.  I have been on the federal Do Not Call list for over ten years.