Slightly OT, but android's "screen call" feature has been my number 1 tool is fighting the robocall battle. It's more responsive than the "let all calls go to voicemail" approach, and 80% of robocalls disconnect by themselves when the bot starts talking. It still requires my live "attention" when the call is going through but I'm not that upset about a few wasted seconds, especially if it lets me grab a legitimate call when it's happening.

https://www.androidcentral.com/how-use-call-screen-feature-p...