iPhone 4G

• The new design has metal sides, round volume buttons and it's almost a quarter thinner than the iPhone 3GS.

• There is also a camera on the front of the phone for video calls and the second camera on the rear - much clearer at five megapixels - has an LED flash.

• And a 'retina display' means four times the pixels can fit in the same space as before while the battery is improved with 40 hours of music and 300 hours of standby time.

• Another key feature is multi-tasking which allows users to run more than one app at a time.

• The phone looks exactly like the prototype first leaked after an Apple employee accidentally left it in a bar.