Volte is not supported on 5z even 4g+ is now not working after latest update.
It is working for many . Contact Airtel customer care..Btw did u have volte before the recent update?
Its not working for all asus mobiles but it supports some other mobiles
It is working for 5z also..If your area have Volte..
My phone is Asus 3 series its not working... you check airtel website
asus zenefone5 modal : T00j. plazas halp update i don't no.