Who called from 7854120370

You answer the phone, say hello, noone answers.  They just wait a few seconds, then hang up.  If you call the number back, it says "this person has not set up their voicemail box."  Never get those 30 seconds of my life back!

Knew my name but call disconnected before I could find out any info

Received a call from this number at my place of employment.  When I answered the phone they laughed and hung up.

called me by name and hung up when I questioned who he was