In Europe, 3G is shutting down, but 2G as a fallback seems to be staying for years to come.
> However, 2G networks were still available as of 2023 in most parts of the world, while notably excluding the majority of carriers in North America, East Asia, and Australasia.
See https://en.wikipedia.org/wiki/2G
AFAIK, in the US, T-Mobile still has a 2G network.