For a few years I have been experimenting with some creative anti spam manual techniques. Hard to say if they are working but these days I do rarely get spam ca

For a few years I have been experimenting with some creative anti spam manual techniques. Hard to say if they are working but these days I do rarely get spam calls. What used to be multiple per day is now down to about one. Could be coincidence however. 1. Often I will end an incoming call as fast as possible if it seems like a spammer. When you do this while the first ring is happening sometimes a few seconds later you will receive a second call from the same phone number. I then end that call as fast as possible again (without answering of course). I am hoping that some of these spam phone software systems have automated processes to mark numbers that are no longer dial-able. 2. Sometimes I answer as fast as possible and then play the oldschool sounds of a dialup modem or fax machine. I have even jokingly done this just making the sounds of a dialup modem with my voice. Many times the automated system hangs up after I do this. Again I am hoping they have something built in to their automated spam system to mark numbers that are fax / modems / non-people. 3. I have also tried answering the phone and then completely covering the mic or playing some simple white noise. This does not usually seem to work and eventually someone picks up. I doubt they are marking my number in this case as it has gone to an actual human.