Caller ID:  Dir Asst 480-555-9439.  I answered and it was 'dead air'.  They hung up before I could hit my Block button.  The number blocker I purchased - I have to answer the call then push the Block button.  After that, it rings once and that's it.  I don't like it but that's all I could afford.  I think I had better luck when I turned my answer machine off.  I guess it told the robo-call machine it is not a working number ; best of all, I didn't have to answer.

phone rang one time three times.  recalled number and just got busy signal.

received  two calls 10 minutes apart. the first rang only once, not giving me time to answer. the second i answer with no sound from the other end except an abrupt hangup. called the number but only got a "this number is not in service"  notification.