Is there any FOSS alternative messenger that handles SMS and RCS? Supposedly RCS is an open standard, but I am not aware of any FOSS messenger that has it. I’d like to move away from google messenger, but there doesn’t look like there is an option just yet.
My only issue with Signal is that it does not seem to (or I cannot get it to) work over wifi in the absence of a cell signal.
Not sure what is going on with your setup, but Signal should work with any internet connection.
It should, it’s not using signal, just internet access