Since its launch in 2007, there have been five models of iPhone. As you’d expect, each generation of iPhone has got more sophisticated, as users’ needs and technology have changed. In so doing, it has managed to consistently enthrall users around the world – despite the odd PR disaster (antenna-gate and Maps). Despite the continual software and industrial design evolution of the device, it can be difficult to tell the difference between some models of the iPhone if you don’t know the release date of your device. This is particularly the case with the iPhone 3G and 3GS and the iPhone 4 and 4S, as the external device design is extremely similar. To understand the difference between the iPhone models, we’ll outline some technical specifications for each generation of iPhone and the new features that were introduced with them, and then I’ll sum up a few ways to identify the iPhone 4 from the iPhone 4S and the iPhone 3G from the iPhone 3GS. The original iPhone (2G) – released 29 June 2007 The first generation of iPhone established the design precedents that have persisted through all models, such as screen and button placement. Unlike its successors, though, the first iPhone features a chrome-plated metal frame and back, and has a very inconvenient headphone socket, which is incompatible with most of the headphones without the use of an adapter. It was marketed as using an “OS X” operating system. Capacity: 4, 8, 16 GB, Processor: 620 MHz, Memory: 128 MB, Camera: 2 MP (no video) iPhone 3G – released 11 July 2008 The second model of Apple’s iPhone may not seem very different from the original iPhone but a number of new features are added – plus, surprisingly, the device is cheaper. A major improvement is the the built-in GPS and the addition of 3G wireless connectivity which increases the download speeds. There are physical changes as well, with the full plastic back and a curvier design and a flush headphone jack, which allows any standard headphones (3.5 mm) to work in the iPhone. Capacity: 8, 16 GB, Processor: 620 MHz, Memory: 128 MB, Camera: 2 MP (no video) iPhone 3GS – released 19 June 2009 This third generation of iPhone adds fine-tuning – it performs much faster than its predecessor and has a better camera (plus video recording and a built-in video editor). The battery life is improved and the storage capacity is doubled to 36 GB. And we now have the Voice Control interface which allows you to control iTunes by voice to tell your phone what artists or albums to play. Capacity: 8, 16, 32 GB; Processor: 833 MHz; Memory: 256MB; Camera: 3 MP + VGA video iPhone 4 – released 24 June 2010 This new generation on the iPhone's family tree was “the biggest leap since the original iPhone ” as Steve Jobs [http://en.wikipedia.org/wiki/Steve_Jobs] put it. It comes with a lot of completely new features. The most significant are: the front camera and FaceTime (which make the dream people had for decades for video calling come true); a retina display; the multitasking function; HD video recording and editing; and an improved camera (5 Megapixels with LED flash). The plastic back is now replaced with a glass case, which makes the phone look more stylish. Capacity: 16 or 32 GB; Processor: 1 GHz, Apple A4; Memory: 512 MB; Camera: 5 MP + 720p video iPhone 4S – released 14 October 2011 It is an upgraded version of the iPhone 4 created in order to go along with its new iOS 5 software. No larger display or new look, physically, it is almost identical to the iPhone 4 with an unnoticeable 3 grams (0.1 ounce) difference in weight. Thus, the differences are mainly hardware related: a better processor - A5 Dual-Core, better camera (8 megapixels plus a welcomed development of 1080p video resolution) and a new antenna system which brings better call quality and reception and solves the well known “antennagate issue”. Capacity: 16, 32 or 64 GB; Processor: 800 MHz; Memory: 512 Mb; Camera: 8 MP + 1080p video, front camera 0.3 MP iPhone 5 – released 21 September 2012 The iPhone 5 comes in two colours: black and slate, and white and silver. It is nearly nine millimeters taller than its predecessor but, thanks to the impressive engineering, it is thinner and feels lighter in the hand. Needless to say, things like the software and the camera have been slightly improved. Another thing to note is that the wireless works faster and doesn’t drain the battery life so fast and the phone now has a Nano-SIM. You’ll also need a different connector for charging and for linking to audio equipment as the new iPhone uses a smaller 19-pin connector (when compared to the previous 30-pin connector). Capacity: 16, 32 or 64 GB; Processor: 1.3 GHz; Memory: 1 GB ; Camera: 8 MP iSight camera + HD (1080p) video recording and a 1.2 MP front camera iPhone 4 and iPhone 4S – which is which? There are not many differences between the two iPhone 4 generations. They are almost identical, but here is what we’ve spotted. Physical features: I think it would have been impossible to distinguish the iPhone 4 from the iPhone 4S at a first glance if it wasn’t for changes in the antenna “breaks”. On the iPhone 4, there are three antenna breaks in the metal frame (one on the top and one at each side toward the bottom) while on the iPhone 4S the break at the top moves around to the side of the device. The pictures below should be helpful in identifying the difference between iPhone 4 and iPhone 4S from now on. This change in the antenna breaks solves the very well publicised antenna issue that users of the iPhone 4 experienced. Software: By holding the home button down, you will get the Voice Control on the iPhone 4, while on the iPhone 4S you will get Siri straight away (an exclusive feature for iPhone 4S and iPhone 5). iPhone 4S is believed to be significantly faster than iPhone 4 due to its dual-core processor, so you should notice a difference of speed when trying to download any application or internet page. Internal differences: The camera load faster and you can take pictures quicker on the iPhone 4S and its capacity is 8 MP in comparison with the 6 MP of the iPhone 4, plus you also have better screen colours and better video quality. iPhone 3G and iPhone 3GS – which is which? The easiest way to differentiate these two models is by looking at the back case. This is also the first thing to notice and very useful if you’re planning on buying your phone on eBay. On the iPhone 3G, the details of the phone (such as capacity and model number) are written in grey, while on the iPhone 3GS they are written in bright silver. Besides the obvious facts that the iPhone 3GS is faster and has a better logic board, here are some other differences between the two generations of iPhone. Software: If you hold the home button for a few seconds on the iPhone 3GS, the Voice Control will pop up, but if you do the same thing for iPhone 3G, nothing happens. In order to obtain the Multitasking function, double tap the home button on the iPhone 3GS. This option is not available for the iPhone 3G. Internal differences: The camera on the iPhone 3GS has a zoom feature, while this function is not available for the iPhone 3G. The iPhone 3GS also has video recording. Another small difference between both iPhone 4 and 4S and iPhone 3G and 3GS is the weight (iPhone 4 is three grams lighter than the iPhone 4S and same is the case with iPhone 3G and iPhone 3GS). Now that you know the differences between the iPhone models, we’d like to know which iPhone you prefer, and also why you chose it rather than another type of smartphone. Just share your thoughts with us and you can win an iPhone case.