Denmark does the same. 3G has been shutdown, or mostly at least. 2G is kept running, with no plans to shut it down in the future.

Things that uses 2G:

  - Electricity meters
  - Alarm systems
  - Cooling and heating systems
  - Rat traps (?)
  - And an absolute crap-ton of early "IoT" devices.

And it's considered a backup network, with better coverage and range than 4G/5G. It also makes sense as the country is actively starting to remove the old landlines. The first cables are actively been removed from the ground.