> I don't think it's possible to make a call-blocker app which functions as a whitelist, sadly, because I think this is like their browser content blockers and

> I don't think it's possible to make a call-blocker app which functions as a whitelist, sadly, because I think this is like their browser content blockers and operates as the app providing a list of blocked numbers for privacy reasons. Oh, that must be why the AT&T Call Protect app fails to block spammers the first time they call me. Always wondered about that.