Public:Software
From OpenCellID wiki
Geoclue 2.1.1
Modem geolocation: If you got a 3GPP modem, geoclue will now be able to use that to locate you (with neighborhood-level accuracy) using opencellid.org. Additionally if your modem has GPS capability, geoclue can use that as well and as you know GPS is the most reliable geolocation source.
