Do you have an updated list of VoLTE and 5G operators in the World?
Refer GSMA site, you will get it.
While googling, there are some links that goes to May2019, nothing found by quick search on GSMA…
You can check Maps in Favorites.
For examplo Ookla has 5G Map that tracks 5G rollouts in cities across the Globe.
GSMA share a list od Mobile IoT networks being rolled out around the World.
And so on…