There seems to be no running SMS sync app available at the moment, but users reported in the project related issue tracker that they got it working with NC 30.x. Therefore you might think about hiring a developer to get it supported on a newer version.
Additionally you can try to use alternative ways to backup SMS, as e.g. described here:
Just out of curiosity, who prefers using SMS messaging over Signal, Whatsapp etc.? I think I personally have written my last SMS years ago.
Thank you for the answer. I will contact our supplier and check if they can help us get Phone sync to work.
We are a municipality and sometimes our citizens are texting our workers, We reply by the secure official communication sytem “Digital Post”. By law we are obliged to register all communicatioon in the case register system and thus we are obliged to register the text messages our workers recieve from the citizens.