Called, left no message.

I'm blocking them with Awesome Blocking feature on the New iPhone.

Number is a collector of student loan debt

bill collector

don't pick up !

Same here, although he never got to leave a voicemail. Wondering when the caller will get tired of calling.

Received a call.  The man who was calling had the line still open on my voice mail and I could hear him say "The phone is still ringing.  No answer."  Then he hung up.  He wasn't aware that my voice mail had already prompted him to leave a message.  I receive a daily call from this number.  Sometimes twice a day, without a message being left.  Go figure.