alt Hacker NewsThere is a week long registration lock protected by a PIN. Your contact list is protected by that PIN as well. They cannot access your chats. All your contacts will get a notification that the contact has changed when they go to talk to your phone number or get a message from your number.
https://support.signal.org/hc/en-us/articles/360007059792-Si...
This is good and means no one can impersonate you using your phone number, but doesn't solve the recurring costs issue, you still need to buy a new number when someone registers yours, and every financial transaction puts you at more privacy risk. And is terrible UX, imagine having to add your contacts new numbers every other week.