enable 4G on iphone X message from Telstra says phone may not work after 8/24

joham wrote:

My service provider, Mate, says I need to enable 4G VOLTE. How to do this?

Settings>Cellular>Cellular Data Options>Voice and Data

I have a feeling that the OP will report that there is no listing or option for Voice and Data.

Guess we will know soon.

Telstra is sending that message to everyone, regardless of the type of phone they have. It really only applies to older phones. Your phone is fine.