No. Nokia 8 does not have an IRIS scanner.
Yes, Nokia 8 does have a fingerprint scanner.
Yes, you can use 2 4G Sim cards in this phone.
No. Nokia 8 does not support CDMA netwok in India.
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.