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.


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