> but the telephony stack just says "working". Where's the Free Software firmware that runs on the baseband processor?
We do mention that issue in the device's pages. There is always a list of "Known freedom issues" and the modem firmware being non-free is one of them. It is simply marked as working because the system (userspace) code is free software and the modem firmwares is preinstalled in the phone. Apart from the ones supported by OsmocomBB, there are no phones that can run a free baseband.