GUIDE Enable VoLTE/VoWIFI [STAR]

[techinbermudas]

If you don't have VoLTE (1st code) or VoWIFI (2nd code) by default you should definitely try the code below in your dialer app.
   

Code:

*#*#86583#*#*

 

Code:

*#*#869434#*#*

 
After that go to Settings > Select Sim Card > Enable VoLTE/VoWIFI.

If after this you still don't have VoLTE or VoWIFI contact your carrier as it might not support this functionality.