[codedokode]

Your phone number and messages can easily be leaked if there is a vulnerability in your smartphone OS or Signal app. However if you use a messenger not requiring a phone number, then attacker gets only the messages.

Also as I understand you have to give your number to your contacts to be able to chat with them. For comparison, Telegram allows adding contacts without sharing a phone number. So in Signal all contacts know your real identity and your location.

[cpach]

I’m not convinced about the reasonability of this threat model where leaking messages is fine but leaking the telephone number means game over.

However, I do understand that sharing one’s phone number is problematic for some users.

With that said: Until Signal implements user names in their system, please note that the user is not required to sign up for Signal with their primary telephone number. One could use Google Voice or a prepaid SIM card for example.