Hi community
Finally the day have come. After some dig on xda developers foruns i was able to enable VoTLE on my device bought outside the Vodafone "world"
have a look
https://forum.xda-developers.com/galaxy-s9-plus/how-to/guide-how-to-change-s9-s9-csc-model-csc-t3870836
No need to root or trip knox, warranty still valid after.
Hope that this helps!