It’s great for snap happy iPhone users, but Apple might not be so pleased because it’s a function that isn’t officially ready for use.
Once it is switched on users can take continuous photos while panning the camera from left to right.
The Easter egg was found by Conrad Kramer, who describes himself on his Twitter profile as ‘Programmer. iPhone hacker. Geek’.
Yesterday he tweeted: ‘So, I found out how to enable Panorama is the iOS Camera app. Set the key 'EnableFirebreak' to YES in com.apple.mobileslideshow.plist.’
Several other hackers have since found the hidden mode, too.
To turn it on, though, your iPhone would have to be jailbroken or you will need to have developer access.
Apple does not recommend jailbreaking your phone, which some users do so that they can download apps not available on iTunes.
It said: ‘Apple's goal has always been to ensure that our customers have a great experience with their iPhone and we know that jailbreaking can severely degrade the experience.
'As we've said before, the vast majority of customers do not jailbreak their iPhones as this can violate the warranty and can cause the iPhone to become unstable and not work reliably.'
It’s thought that the panorama camera mode is currently undergoing testing before being enabled for general use.
Apple's iPhone 3G has won a public vote to find the year's best gadget, beating strong competition from three games consoles, a laptop and a balloon-shaped iPod speaker system. Th