Because we still haven't decided to support it. It's not the same as supporting VoLTE which is much easier. Another reason is that we use the same FW for most parts of the world. It makes it a lot easier for us to keep bugs away if we have fewer different firmwares and this feature is almost exclusive to India. It's not something that users in other countries want to have visible. I'm not saying it will never happen but this is the reason why we don't offer ViLTE today
That what i asked why Asus excluding Indian customer needs ?? Asus Indian CEO promised that they are launching 6z with keep in mind Indian customers ,, don't u think India has huge market for cell phone industry ??