I am using iodéOS on my Fairphone 4 and I experience the problem that the FP4 is not able to find locations when I am indoor (house, mall, …). I would expect that the microG services are able to offer Wifi-based and cell-based locations but it does not seem to work.
The latest microG beta release (0.3.3…240913) allows use of either positon or beacondb as the 'online location service. I’ve been using positon fr a while, with no problems
It’s the Positon location service - see https://positon.xyz/ - an alternative to the defunct Mozilla system or the beacondb.net service mentioned above