An update to my previous post. IOS 14.1 caused a problem with the call blocking features on the iPhone. The solution is to delete your 3rd party call blocker app. Shut the phone down and restart it. Then reinstall the call blocker app.
As I said, the Call Protector app, free version, allows you to block individual numbers or ranges of numbers. It has an extensive database of spam number, although it is not perfect. It also has a phone number lookup feature that lets you look up who a phone number belongs to. I am sure other apps are out there that work the the same way.