Removing SMS support from Signal Android (soon)
signal.org
For many years, the Signal app on Android has supported sending and receiving plaintext SMS and MMS messages in addition to Signal messages. SMS and MMS are standardized communication protocols that allow mobile devices to send and transmit messages, and most people picking up their phone to text...

Signal entfernt das SMS-Feature aus der Android-App und kündigt an, dass somit Usernames kommen könnten.