WiFi Calling is not working since upgraded to iOS 15

On my iPhone 11 WiFi calling not working since upgraded to iOS 15. Mobile service provider is Airtel India. WiFi calling toggle is enabled but its not doing its work at all.

I tried general > about to get the carrier update but there is no update pushed. Also, tried network reset too.

is this issue because network service provider needs to send Carrier update or bug in iOS 15?

Same for me. I’ve tried all the tricks. Did you get it solved?

WiFi Calling is not working since upgraded to iOS 15
 
 
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