My call logs show I got a call from this number, and the length shows it hung up after one or two rings.
Name Number When Length
BACKNKNEEOFFI 530-488-7030 Fri, 08-07-15 0:08
Android app. "Call Blocker" is very effective blocking callers that are not in your calling list. Keeps log of calls, you can add to white list to accept calls or blacklist to block permanently. I'm happy with the program.