I believe so. They use a dual stack model and last I checked Airtel doesn’t support IPv6 yet and neither does Vi which leaves Jio to be the only ones contributing to the stats.
Airtel supports dual stack as well. I have been using Airtel Internet with IPv6 for a year or two now.
I tried on my iPhone SE (2020) 3 months ago and I could not get iPv6. Could be location specific. Because I specifically tested for iPv6 support.
Airtel does dual stack model. I've been using it for about 2 years now.
Airtel doesn't seem to support IPv6 for their broadband services yet, at least in my state. Have you experienced this with broadband or mobile services?
Airtel mobile supports IPv6
You are right. Only mobile services support IPv6, not their broadband.