Lock Down Your Signal: Ultimate Hardening Guide (youtube.com)
#1 request by people was that Signal would hide their phone numbers so it wouldn't be that everyone in the world would get access to your phone number just in order for you to use the app. So now, you can go to Settings > Privacy > Phone number, and change ‘Who can see my phone number’ and ‘Who can search for me by my phone number’ to ‘no one’ and you can only be searched afterwards by someone searching for your username.
They also have safety numbers now to validate conversations (like if a user installs on a new phone, whether it's a fake scammer or the actual person). So you share the safety number on another app or in person.
#Privacy