Yes, Nokia 7.1 does have the Carl Zeiss lens at the back camera.
Yes, Nokia 7.1 does have OTG support.
No. Nokia 7.1 does not carry any kind of IP certification or ratings. The mobile is certainly not a water-resistant or dust-proof mobile.
Yes, Nokia 7.1 does have the portrait mode.
Nokia has quietly released one of the most exciting inexpensive phones of the year in the Nokia 7.1, a well-designed phone that delivers first-rate performance.
With the Nokia 7.1, the brand continues its run of impressive mid-range phones carrying close-to-stock Android. While the phone has weaknesses, overall it offers better quality and features than you would expect at this price.