This is a debt collector you can look up on the Internet,. It is found at: http://www.dcicollect.com/ and this particular number is not one of the ones listed on the website, but calls are answered as Diversified Consultants.
Just got a new cell 4 days ago (cheap, prepaid type), and have given no one but my wife the number. Today I got a call from this number. I didn't answer, but immediately did a search. Interesting world. I'm not late with any bills, so I wonder what would have happened had I answered.