1. A mobile telephony system comprising a calling party mobile telephone with an imaging system and a display, the imaging system operable to capture an image of the calling party, in which the calling party mobile telephone sends an image of the calling party to a called party mobile telephone over a wireless link, and the called party mobile telephone locally generates a holographic reconstruction of the calling party using a holographic display that is encoded with a computer generated hologram, wherein data processing for three dimensional image display is performed at an intermediate system located on a transmission network between the calling party and called party mobile telephones, the intermediate system including a computer for performing calculations to enable the display of three dimensional computer generated holograms.