Users can explicitly send SMS messages (long press the send button and select "insecure SMS"), but this option isn't sticky -- I think if the app restarts it wi

Users can explicitly send SMS messages (long press the send button and select "insecure SMS"), but this option isn't sticky -- I think if the app restarts it will again default to Signal messages. As you say, unregistering your Signal account[1] is the only permanent solution. [1]: https://signal.org/signal/unregister/ https://signal.org/signal/unregister/