How do I block Restricted, Private, Unknown, or Anonymous calls? May 11, 2019 02:02 Follow Unfortunately, Name ID cannot block restricted, private, unknown, or anonymous calls. Related articles Can Name ID lookup Private, Restricted, Unknown, or Anonymous callers? How do I view my history of blocked calls? Can Name ID block text messages? What is free scam blocking? How do I know Name ID is sending a call to voicemail?