What is the Norwegian government planning to do with the newly freed FM band? Release it to amateur music radio stations?
A slot with only 100 kHz bandwidth will give you modem speeds, like 24,4 bits/s. So there's just not revenue to make so small speed for modern broadband networks since everyone need to share the channel.
The other issue is that the band 88-108 MHz have so big coverage, so there will be problems with the cell spacing.
So 4G via FM is not a business case. However, the DAB channels are already planned for 1,4 MHz LTE. So guess what will happend in the near future?