received call.   No message.   Based upon the other reports, I will ignore in the future.   (add number to phone book under "Annoyance" with  customized silent ringtone.)

I called this # back and received a recording that my call was important but after 6 minutes the recording said goodbye and I was disconnected.

"Service Call" on caller ID. We didn't answer. No message left.

Unknown call; I answered, but no one was on the other end, or they did not reply (maybe it was a recording I needed to wait for?)