What is Scam Blocking? CallWatch Support - August 18, 2015 21:50 When Scam Blocking is enabled, known scammers will be automatically blocked by CallWatch. Related FAQs: How do I disable Scam Blocking? How do I block Restricted, Private, Unknown, or Anonymous calls? What if the number I want blocked isn't 10 digits in length? How do I block a number with CallWatch?