The status bar does not display the VOLTE logo, which means that the device is not registered to the VOLTE network.
1. Contact the operator's Volte high -definition call business;
2. Device needs to support VOLTE HD calls and open functions (enter the settings "mobile network" Click the corresponding phone card "Volte HD call" opening function
3. The area where it is located requires the flower cover operator VOLTE HD calling network Note: Some models have default to turn on the Volte HD calling function without setting options.