Don't have VoLte

[shrutihegde08]

My phone model is Asus zenfone 3 max. I don't have VoLte option. And I'm not getting any system update as well. What should I do to get VoLte?

[ARP_ASUS]

Hi,
Refer to this and update your phone manually:
https://www.asus.com/supportonly/ASUS%20X00GD%20(ZC521TL)/HelpDesk_Download/
How to update:
https://www.asus.com/support/faq/1009748