About half a year ago, I published some statistics about 102 unsolicited phone calls – now it’s time for an update with the data from the rest of the year. The number of such calls to me clearly decreased: to about one third, from 102 in weeks 4-29 to 31 in weeks 30-52 (labeled “~H1” and “~H2” in the following diagrams, because they don’t exactly correspond to the half years).
Maybe thanks to the nice message (implemented with myand my ISDN phone with answering machine) for callers who do not transmit their caller ID which says (translated)
“Good day. You are calling without transmitting your number. Since this is typical for unwanted commercial calls, you are directly – without audible ringing – directed to this answering machine. Please enable your caller ID transmission, or leave a message so you can be called back. Thank you.”
one or more cold call centers kicked me out of their database.
Of course the “no number => unwanted” conclusion isn’t always 100% sure, but who calls me legitimately can leave a message or try again with caller ID – these (few) cases have been taken into account here.
Here’s a breakdown by weekday, time of day, and calendar week:
(The new calls since week 30 are represented with the dark parts only, not the entire columns.)