I have a phone block device. When an unknown number shows up on caller ID, I hit the block button and it saves that number and blocks it. I’ve not had a 2am call or a 6am call from any scammer for months. Even the evening time is peaceful now.
My cell has a “do not disturb” feature, where if it’s on (most times) caller IDs which are not on my favorites list go to voicemail.