Airtel VoLTE issue in Asus Zenfone Max pro M1
I ported from Vodafone to Airtel, now in my airtel sim volte enable option is not available.
but when I inserted another airtel sim into my mobile then volte working properly.
And my same airtel sim card insert into another phone then also volte working properly.
I reset my phone totally (lost total data), than VoLTE is working fine, but i lost sim and than get a new Airtel sim than again VoLTE is not coming.
I tried with *#*#4636#*#* but there is no VoLTE enabled option.
Build number 2007.084
My phone is Asus max pro m1.