The most expensive iPhone 6 is out and it is currently on sale for £2.3m which is approximately, N790m when changed to our currency. The case is plated in 24-carat gold and it is encrusted with more than 700 diamonds, which makes it unique and special.  Usain Bolt, David Beckham and music producer P Diddy already have one. See more photos of the special device after the cut.