https://signal.org/blog/phone-number-privacy-usernames/> Usernames simply allow you to initiate a connection on Signal without sharing your phone number
> Starting soon, your phone number will no longer be visible to people you chat with on Signal, unless they have it in their phone’s contacts. You will also be able to configure a new privacy setting to limit who can find you by your phone number on Signal. And, you’ll now be able to create an optional username that you can share with the people you want to connect with on Signal.
