They called and I didn't answer.  They hung up when the answering machine came on...and the phone number didn't have any identity attached to it.  Another phone number for me to block.  I block all phone numbers if I don't know who the person is and haven't personally given them my phone number.  I don't accept business calls at all.  I have an unlisted phone number and I believe that it should be illegal to call people who do not make their phone number public.  But even though I have had an unlisted phone number for many years, AT&T published it once instead of charging me $4.95 a month to have my phone number unlisted and that's when I started getting a lot of robo calls.  AT&T said that they would give me a new phone number but  that would cause to many problems so I am blocking all phone numbers that I don't recognize or that call themselves "unavailable" or some crazy name like "Kentucky" that I don't recognize.