SMS still works currently. But on my version 6.9.1 it shows a nag message at the bottom that SMS support is going to go away at some point. With an offer to export the SMS to the phone database.
It is also not possible to enable SMS support again from the Signal options itself. Though it can still be set from the Android settings.
I presume it will actually stop being supported completely in a future update. I wouldn't think the feature requires any support from the Signal servers, so I reckon you would be able to use it for as long as the app still works.
In the end I accepted this turn to the worse and exported my SMS history and switched to Silence. Turns out I don't actually use SMS much. Mostly just for delivery notifications.
It is also not possible to enable SMS support again from the Signal options itself. Though it can still be set from the Android settings.
I presume it will actually stop being supported completely in a future update. I wouldn't think the feature requires any support from the Signal servers, so I reckon you would be able to use it for as long as the app still works.
In the end I accepted this turn to the worse and exported my SMS history and switched to Silence. Turns out I don't actually use SMS much. Mostly just for delivery notifications.