Caller ID came up "John Koester". Called twice, no message. Blocked caller #562 (two Panasonics + 20 ATT IDs), idiot call #1156 (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 four times the 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.