No. Nokia 8 Sirocco is not a dual sim mobile phone. It is a single sim mobile phone.
No. Nokia 8 Sirocco does not have the 3.5 mm headphone jack. But inside the box, you will get it USB Type C to 3.5mm headphone cable to use your old headphones.
Yes, Nokia 8 Sirocco does have the NFC support.
Yes, Nokia 8 Sirocco does have the Corning Gorilla Glass 5 protection.
There's no denying that Nokia 8 Sirocco is a step up from last year's model. With the Sirocco, HMD proves that it can design a phone that is stunning to look at and stands out in the crowded smartphone space.