activate VoLte on unrooted device

[Sashtheflash]

Is there any possibility I can get the volte setting to show up on an unrooted European dual SIM model?
Via adb for example?

 

[shivadow]

Call settings, scroll down to the bottom and allow Internet calling for all calls. Keep your data active and when you make a call on 4g it will switch if the network is capable. Be aware that it can munch through your data plan!.

Beamed in by telepathy

 

[Sashtheflash]

That is exactly the problem.. there isn't such an option.. this only is there with the Single Sim Variant. Dual Sim Variant doesn't show it..

 

[wonder_skydive]

Sorry for bump this old thread but I have the same model and issue.
I have a HTC u11 European dual simm, I don't have this option in my menu, my carrier (Vodafone ES) have a VoLTE but I can't work with VoLTE.
I don't have root the phone.
If in cal, I type *#*#4636#*#* appears the option VoLTE but I can't change this option for enable.

Its possible enabled VoLTE in unrooted phone and in the dual simm version?

Thanks and regards.