This number is calling numerous times, one after another. Now, they are sending a text page as well. There is never any one on the line, nor is there any voicemail left. I called my phone company yesterday, and blocked the number today myself.

I have figured out it is a cell phone in Morristown NJ, listed to Sprint PCS.

Same thing happening here -- same number

Just got called by this number.  I did not answer and there was no message left.

Is probably Source Advantage, collection agency.  Area code and exchange are the same, and they call from cell phones in Morristown, NJ area.  They're not leaving a message because you would recognize the caller, and not pick up next time.  Bet on it!