I use the Firewall app on iPhone. All phone numbers in my Contacts app go into a whitelist that is maintained only locally on my phone. When a call comes in,

I use the Firewall app on iPhone. All phone numbers in my Contacts app go into a whitelist that is maintained only locally on my phone. When a call comes in, a notification gets fired off to the Firewall app, and it checks the number against the whitelist. If the number is on the whitelist, then it actually uses a functional replica of the iPhone Phone app UI to "ring" the call through. If the incoming call is from a number not on my whitelist, then it checks the blacklist of known bad actors. If the caller is on the blacklist, then the call just gets blocked. I get a notification from Firewall that a call from a known bad actor was blocked. If the incoming call is not on the whitelist or the blacklist, then it goes to voicemail, where it gets transcribed, and I get a notice that Firewall sent a call to voicemail. I'm hoping that this is basically the same workflow we will see with iOS 13, just built into the basic iPhone Phone app. Then I should be able to stop using Firewall. But I certainly don't need Nomorobo or any other such tool. Firewall solves all those problems, and does so better than any of the alternatives.