@kkarhan i agree with 2G being more resilient - or rather more supported than VoLTE and VoLTE roaning! - and a 3G before a 2G shutdown.

But I want to add that CellBroadcast (as a synonym for emergency warnings) was not reactivated, but introduce by law (in Germany)

Secondly: I read you're implying "2G has CellBroadcast" - so does 3G (and 4+5G have the same functionality, though implemented slightly different)