Spam filtering for phone calls is in its infancy. Only 20% of calls are signed https://transnexus.com/blog/2022/shaken-statistics-november/ https://transnexus.c

Spam filtering for phone calls is in its infancy. Only 20% of calls are signed https://transnexus.com/blog/2022/shaken-statistics-november/ https://transnexus.com/blog/2022/shaken-statistics-november/. Some robocalls are signed. Many legitimate calls are blocked. I ignore all unknown callers.