T-Mobile will stop using the 2G network by the end of 2020

The Dutch provider T-Mobile will switch off its 2G network for mobile phones on November 15, 2020.
Devices that are only fit for the 2G network can no longer be used with the T-Mobile network.
With 2G customers can call, text and access the internet at low speed. T-Mobile writes that these options are now automatically routed over a 3G or 4G network. “That is why we are using our old 2G network.”
On the website of T-Mobile, you can see which phones only work on 2G. The provider can no longer use those devices from the end of 2020.
Other providers stop 3G instead of 2G. Vodafone will stop offering 3G in 2020, KPN will follow in 2022. They retain 2G to be able to fall back on. The telephone providers use the released frequency bands for the 4G network.