Volte Option not comming

[soumyabikash_te]

Hi asus,
I am using asus zenfone max pro m1(4GB) and I am not getting the volte option for vodafone in network setting whether this Vodafone sim showing volte on other phone. But I am getting volte option for Jio on my zenfone max pro m1 but when I use vodafone of Calcutta circle I am getting volte option.
Even in zenfone lite L1 and zenfone max m1 not showing the volte option for vodafone west bengal circle sim.
Is there network band issue that is not supported in asus phone?
If Build number is Firmware Version then
Build number: PKQ1.WW_Phone-16.2017.2007.084-20200706.
If not then tell me how to know the firmware version.

[Yachendra]

The issue is with SIM/Network Provider in some locations.
This device support VOLTE for all major networks in India.
Currently I use Airtel(Ported from Vodafone) and Jio networks both with VOLTE. Before VOLTE worked on Vodafone and I used Idea SIM before in this device.