Caller ID said "UTD CANC SUP FD"  I answered but there was no one on the line.  Sounds like another fake cancer charity scam!

Added to Call Blocker

Caller ID came up "UTD CANC SUP FD".  No message.  Blocked caller #533 (two
Panasonics +  20 ATT IDs), idiot call #1092 (not including obvious mis-dials)
since 5/2/13.  Caller ID "1" (100-000-0000) has called 70 times, including 12 in
one day, 6 on another.  I also had to block my own scammed number as thrice
caller ID indicated that I received a call from IT!

I have kept all of these numbers on a spreadsheet with dates and number of
calls.  Since both blocking systems are now full, I have been recycling the
older numbers that only called once or twice.

Ran into the same as Gordon. When you see this number... Call Blocker!