R.I.P. Scout26
Why do you need an app? My Galaxy S111 has a feature called "Add to Reject List." If I get a call from a marketer, I just add it to the reject list, and I never hear from them again. Not an app -- it's built into the operating system.
National do not call list works for me...
I have a Motorola droid something or other. Where is the setting on yours?
I have the same built-in app on my Galaxy S4 (yeah, old tech). It does auto-reject calls on the list, but they can still leave a voicemail.