Several calls from this number today.  They don't leave voicemail and calling their phone number back gets the same full mailbox message others have gotten.

They have been calling me for the past week non stop every hour on the hour

They keep calling and when returned call it says that mailbox is full.

Yea me too. they have called me at least 20 times in the past 7 days, every thirty minutes in some cases. I called it back and..."this mailbox is full" ....Annoying!!!

I got a call from this number - coincidentally I've recieved calls from 3 other phone numbers with the same '201' area code.  I received an email from a friend last week stating that cell phone numbers would now be accessible to telemarketers.  I immediately went to the www.donotcall.gov website and registered my cell phone number there.  I don't know if this will help anyone, but I thought it might be worth a shot.  NOTE:  The website says that if you receive calls 31 days after registering your phone number, to report it to them.