I actually had to purchase phones that block more than 100 numbers.  Most of these numbers are spoofed.  I get calls from the number "1", as well.  NOBODY has that phone number!  The do not call registry is not working as it should.  I gave up reporting all of these kooks a LONG time ago as it was way too time consuming to do so.  Besides, how would they even go about investigating spoofed numbers.  That's an FBI and FCC issue and I don't think it's on their list of priorities.