On my google pixel I have call screening of unknow caller and most display potential spam and the problem these types of calls don't seem to ring and land with missed calls and when research on the web show unknown #. So are these spooked robocall calling to many different callers at the same time. These are hte type of call I would prefer not to answer and the few I did manage to answer all I got was dead silent than the unknown call just disconnect. Are these really these see how many numbers is valid one and get to add to there calls list and each time they call it a different # so it seem to be a waste of time to keep block other than the best way to report the caller to my phone service.