Received call on my cell phone in the Denver area and no voicemail was left.  I only use my cell number for personal friends and emergency numbers.  I have also received calls from similar numbers (720-256-5185 and 720-256-1055) and answered because I was expecting a call and those two numbers resulted in an automated female voice talking about a warrant expiring (no specification on WHAT warranty).  Clearly a scam.  I suspect this one is too.