A standard Rolls-Royce Phantom has four doors. The current Phantom VIII is a four-door luxury saloon, with two conventional front doors and two rear-hinged coach doors for the passenger compartment.
The Phantom name has been used since 1925 across eight generations of full-size Rolls-Royce cars. Although early Phantoms were often supplied as chassis for custom coachbuilt bodies, the standard modern Phantom is configured as a four-door saloon. The extended-wheelbase version adds rear-seat space rather than extra doors.
The number can be confused because the Phantom family has included two-door derivatives. The Phantom Coupé and Phantom Drophead Coupé were both based on the Phantom but had two doors. Those are separate body styles, not the standard Phantom saloon. The rear-hinged doors on the saloon also do not make it a six-door car; they are simply the two rear doors.