Measuring 7.6mm thin and weighing in just 112 grams, the sixth-generation iPhone is 18 per cent slimmer and 20 per cent lighter than the 4S model. But with the world's best operating system, a bigger screen, a gorgeous, all-new design, more brawn and a better camera, it's an improvement that's almost impossible to measure.
The iPhone 5's extra height means it's got room for a larger, four-inch screen. And what a screen it is. It's brilliant for watching widescreen HD video while you're on the go. Not least because with a whopping 326 pixels per inch and higher colour saturation, you can expect some of the most vivid, vibrant images ever seen on a smartphone or tablet.
Power isn't everything in the smartphone world. But it's also very welcome. Thankfully the iPhone 5 doesn't disappoint. Thanks to its on board A6 processor, which is twice as fast as the A5 model that powered the iPhone 4S, this handset is a joy to use. Not only do apps open and close faster than ever, the extra power also means it handles 3D graphics with aplomb for some truly staggering mobile gaming experiences.
And don't worry about all that power draining the battery. The A6 is custom-made for the iPhone 5 and is designed to be as power efficient as possible. The upshot is eight hours of browsing or eight hours of talk time, or up to 10 hours of video playback.
Speed is another of this phone's fortes. Because it supports 4G networks (subject to carrier), iPhone 5 owners can expect to surf the web at speeds up to six times faster than 3G.
If a great camera is what you're after you're also in luck. The eight megapixel iSight camera from the iPhone 4S has been improved and given enhanced HD video recording and a fantastic panorama mode. It's also better in low light conditions and offers faster photo capture to ensure you don't miss those unmissable moments.
As with every previous iPhone, the iPhone 5 showcases entirely new software in the shape of iOS 6. This time around you get a massively improved version of the Siri voice commands app that allows you to speak Facebook updates out loud and even get voice results for where to eat and what movies to watch. Plus, for the first time you get the Apple Maps app, which teams turn-by-turn directions, real-time traffic information and spoken directions to get you there.
Other features of the iPhone 5 include 32GB of storage, a secondary 1.2-megapixel camera for video calls with the FaceTime app and a choice of tens of thousands of great apps and games from the App Store download market.