https://code.fairphone.com/contentx/2018-02-20_special_update.html
“A special update has been released. You can get it only through the updater.
The changes in this special update are going to be included in the binary blobs of the March monthly release, due out in early March.”
… LineageOS on the Fairphone 2 uses those binary blobs to access the hardware, just like Fairphone’s OSes do.
They are installed seperately from the OS, so when switching from Fairphone OS or Fairphone Open OS to LineageOS you usually don’t lose them and LineageOS just continues to use them.
So, if the necessary changes are in the blobs, LineageOS is affected, as well as other alternative OSes on the Fairphone 2.
The community maintains a modem.zip for easy installation of those blobs.