They KNOW they’re spam calls. They KNOW the uncheckmarked numbers are not valid. So why the hell do they let these calls through? Anyone know?
Verizon's call filter blocks anything that is suspected spam (if you set it so.) There is also a setting "Silence junk callers" that specifically silences "spam likely" (even without call filter.) I very rarely get a call that rings through. Check to see if your carrier has a spam blocking app.