Many calls from this number over the past couple weeks. No messages are ever left.

I got a call from this number, but did not leave a message.

Several calls from this number - no message is ever left.

Call from this number.  No message left.

This number called and left no message.  This is a rash of unfamiliar numbers I received after I answer just ONE robo call!  Once it detect a live person, my number is sold to telemarketers.  Moral of this story:  DON'T EVER EVER ANSWER A CALL FROM AN UNKNOWN NUMBER.  Recently got myself a Panasonic cordless phone with capacity to block 250 numbers.  This telemarketing number is going into the blocked pool.  Come on, I am ready for the next one:)