Nokia N84

No such Nokia Nseries phone has been announced yet (May 2009), this phone is still just Vapour Ware.

Are you looking for the Nokia N82 or Nokia N85?

As the number 4 is regarded as unlucky in many Asian countries I don't expect this model number will ever be used by Nokia. More background from Antony Pranata on why 4 is unlucky.

There are plenty of other Specific Phones in the S60, Nokia Eseries, and Nokia Nseries ranges, some of which aren't Vapour Ware.