Yes, Nokia 8 is a metal body phone. It is made of 6000 series Alluminimum Alloy.
Yes, Nokia 8 does have an OTG support as well.
Yes, Nokia 8 is a true 4G network and it shall work with Airtel VoLTE.
Yes, Nokia 8 does have Always On display.
It’s safe to say that if a smartphone like this had shipped from the Nokia stable a few years ago, the Finnish company might never have had to step back from the mobile business.