iPhone4S is the latest model of iPhone,released on 4 October 2011.On the surface it looks similar to the older model - iPhone4,but under the hood iPhone4S is equipped with so many advanced hardware and software features that have earned this phone great accolade both from industry and iPhone critics.Unlike iPhone4,Apple calls iPhone4S as world's phone as it supports both GSM and CDMA networks.iPhone4 could not support both networks simultaneously,Apple had to produce two separate versions of iPhone4,one that supports GSM network and the other that supports CDMA network.As compared with iPhone4,iPhone4S is equipped with so many other advanced and novel features that makes it much more superior to iPhone4,like Siri - voice operate intelligent assistant,8-megapixel camera,dual-core A5 processor,iOS5,dual antenna wireless communication system ensuring better call quality and higher data download speeds,and higher capacity flash memory,iPhone4S has also retained some old good features of iPhone4 like retina display,touch-proof glass on the front and back,stainless steel band,assisted GPS,orientation sensing,light sensing and proximity sensing.iPhone4S is available in two colours,i.e. black and white. A brief description of some salient features and technical specifications of iPhone4S is given below.
- Siri : Siri is a voice operated intelligent personal assistant that iPhon4S is equipped with.Siri on iPhone4S lets you use your natural voice to set reminders,schedule meetings,write and send text and email messages,place phone calls,check weather and much more.It is not like any conventional voice recognition software that recognizes only some pre-set keywords and specific voice commands.It is intelligent enough to understand what you say and it knows what you mean.That's why when you talk to it and ask it to do some task for you,it even talks back to you if it needs further information to complete the task.You can talk to it the way you would talk to any person.you can ask Siri to do things for you by talking to it the way you talk naturally.It uses almost all the built-in apps on iPhone4S to perform multiple tasks as per your voice commands and conversation with you.When you need to know anything ask Siri,it will search the web and will keep asking you questions until it gets the appropriate answer to what you are actually looking for.By searching the web,it can find the location of nearest restaurant or any other facility about which you need to know.You can ask it to wake you up in the morning by setting alarm.Using this application,iPhone4S can even take dictation from you.You can even ask Siri what it can do for you - it even talks for itself.Siri is indeed such a mind-blowing application,capable of performing myriad of tasks for you,that a complete article may be written on this application.Siri is currently in beta and Apple will continue to improve it over time.
- Dual-Core A5 Chip : iPhone4S is equipped with 1GHz dual-core A5 processor chip,which has twice as much processing power as A4 chip of iPhone4 has and it can process graphics up to seven times faster than A4 chip of iPhone4S.Due to the extraordinarily high processing speed of A5 chip,iPhone4S is quite quick and responsive,which can easily be observed when launching any application, gaming,watching videos or browsing the web.Pages load quicker and gameplay is better.Everything feels faster.That's why iPhone4S is ideal for gamers and graphics-intensive applications.Despite its stupendous processing power,the A5 chip is quite power-efficient and that's why iPhone4S has excellent battery life.
- Camera : iPhone4S is equipped with two built-in cameras one on the front above display and one on back near LED flash.The camera on the front is tuned to FaceTime.Unlike iPhone4,it is equipped with 8-megapixel camera with all-new and advanced optics and the custom lens with a larger f/2.4 aperture.To make the entire image look sharper the custom lens uses five precision elements to shape incoming light.With 8-megapixel its camera gives you 60% more pixels than the camera on iPhone4.Apple claims that it might be the best camera ever on a mobile phone.Its cameras are engineered with higher,full-well capacity to collect even more light.With higher megapixels and more light they can capture images with extraordinarily sharp details and resolution.Its cameras feature auto-focus,tap-to-focus,video stabilization and face-detection in still images.The camera on its back is also equipped with an LED Flash,which supports video recording,HD (1080p) up to 30 frames per second with audio.Front camera is capable of taking VGA-quality photos and can record video at up to 30 frames per second.iPhone4S also features video and photo geotagging.The A5 chip and iOS5 are actually the real power behind the camera of this phone.According to Apple,the A5 chip is designed with an image signal processor,that's as good as the ones found in DSLR camera.Due to the processing power of A5 chip behind iPhone4S camera,you can tap to focus,control exposure and enjoy the zero shutter lag feature of its camera.The image signal processor also makes your camera very fast and efficient so that you may catch the action as it happens just in a split second.Due to the advanced algorithms in iOS5 that iPhone4S camera utilizes,the images and videos shot by this camera are perfect in colour accuracy,whit balance and dynamic range.That's why photos shot by this camera look quite natural and vivid.The camera also features face-detection.It is smart enough to figure out whether you are taking a portrait or a group shot.It focuses on the most prominent face in the frame and balances exposure across upto ten faces.In addition to this mind-blowing camera,the iPhone4S is also equipped with an a photo-editing software,which serves as an on-the-fly editing studio.You can do a lot of things to the photos shot by this camera right on the phone without any need to use any software after transferring your photos to the computer.Using your phone,you can not only crop,rotate and enhance the images but also you can remove red-eye from the images.HDR is an amazing image processing feature associated with camera of this phone,which renders it the capability to capture stunningly vivid and natural photos.To put this amazing feature to work for you,just tap the HDR and take a photo.As a result of which,the iPhone4S will take three photos from a single shot,each having different exposure level. To give you the best of the three shots,it layers three shots together to create a single photo that contains the best parts of all the three shots.Both the original and HDR photos are saved by the phone in its memory.With the "Photo Stream" in iCloud,the new photos that you take are automatically transferred to all your devices i.e., iPhone, iPad, iPod touch, Mac, or PC.With Airplay,you can also share your photos on HDTV.
- Physical Dimensions: The physical dimensions of iPhone4S are almost the same as that of iPhone4,with the only difference that it weighs slightly more than iPhone4.It is 4.5 inches (115.2mm) high,2.31 inches (58.6mm) wide,0.37 inch (9.3mm) deep and its weight is only 4.9 ounces (140 grams).
- Cellular and Wireless Support: Unlike iPhone4,it is claimed to be the "World Phone" as it supports multiple cellular and wireless networks .It supports UMTS/HSDPA/HSUPA (850, 900, 1900, 2100 MHz),GSM/EDGE (850, 900, 1800, 1900 MHz),CDMA EV-DO Rev. A (800, 1900 MHz).For wireless connectivity,it is equipped with 802.11b/g/n Wi-Fi (802.11n 2.4GHz only) and Bluetooth 4.0 wireless technology.According to Apple,iPhone4S is the first phone to switch intelligently between two antennas to transmit and receive,so as compared with iPhone4,this feature of iPhone4S not only makes the call quality much better but also it doubles the HSDPA data speeds.That's why iPhone4S supports maximum data download speeds (HSDPA) of 14.4Mbps as compared with maximum data down speeds (HSDPA) of 7.2Mbps on iPhone4.
- Location Tracking : For location tracking it is equipped with Assisted GPS,support for GLONASS,Digital Compass and Wi-Fi.It can poin-point your location on the map using a combination of GPS/GLONASS,Wi-Fi and cellular towers.Support for GLONASS is an new feature of iPhone4S that iPhone4 lacks.
- Power and Battery: It is equipped with a built-in rechargeable Lithium-ion battery.The battery may be charged by a power adaptor or USB to computer system.It supports a talk-time of 8 hours on 3G and upto 14 hours on 2G (GSM).It has standby time of upto 200 hours.It supports internet usage upto 6 hours on 3G and upto 9 hours on Wi-Fi.It supports video playback upto 10 hours and audio play back upto 40 hours.
- iCloud: iCloud stores your music photos and documents,and more and through a wireless interface,it automatically pushes them to all your devices (iPhone, iPad, iPod touch, Mac or PC etc.) in seamless and secure way without requiring any effort.iCloud is much more than a hard drive in the sky.It gives access to your music,latest photos,apps and much more from whichever device you want to use.It keeps your emails,contacts and calenders up to date on your devices without requiring any synchronisation and man management,iCloud does it all for you.When you sign up for iCloud,you automatically get 5GB of storage space,which is a plenty of space because of the way iCloud stores your content.If you need more space you can easily storage upgrade right from your device.
- iOS5 : The iPhone4S is shipped with iOS5 operating system.As compared with iOS4,this new operating system is equipped with 200 new features for iPhone,iPad or iPod touch.With Notification Center,that iOS5 features,you can receive all kinds of notifications on your iOS device i.e., new email, texts, friend requests, and more.It gives one-swipe access and notifications appear at the top of your phone's screen and disappear quickly thus they cause no interruptions to you.With iMessage,the new messaging service that Apple has created for iOS5 users,you can send unlimited text messages via Wi-Fi or 3G with your iPhone,iPod touch or iPad to any one having one of those devices.iMessage is built into Messages app,so can send photos,vidoes,texts and locations to any one.You can also benefit from group messaging feature to keep anyone in the loop. iOS5 features a custom newsstand for all your subscriptions.Using this application,iOS5 organises all your newspaper and magazine subscriptions in Newsstand,which is actually folder which lets you quickly access your publications quickly and easily.iOS5 supports setting reminders feature,which helps you organize your life in to-do-lits with complete dates and locations.Twitter is integrated right into iOS5,which makes it quite easy for you to tweet from your iPhone,iPod touch or iPad.iOS5 also supports many new features for camera like use of grid lines, pinch-to-zoom gestures, and single-tap focus and exposure locks to compose a picture on the fly and many more. iOS5 supports many photo-editing features like turning your snapshots into-frame worthy photos in just few taps,crop,rotate,removing red-eye from your photo without leaving photos app,organising your photos in the albums right on your device and much more.With Safari Reader iOS5 brings more and better web-browsing features to iPhone,iPod touch and iPad like tabbed browsing,tap to read articles without clutter and tap to save page to read later and much more.iOS5 renders you PC-free.With iOS5 you no longer need a computer to own an iPhone,iPod touch or iPad.You can activate and set up your device wirelessly.You can download iOS software updates directly on your device.Using Wi-Fi Sync you can wirelessly sync your device to your Mac or PC.With Airplay feature that iOS5 supports, you can wirelessly and securely stream whatever’s on your iPad 2 or iPhone 4S to your HDTV via Apple TV.In addition to all these features iOS also features a calender,better inbox,game center,Multitasking gestures for iPad2 and better features of accessibility for people with hearing,vision,mobility and cognitive disablities.iOS is comapatible with iPhone,iPad and iPod tocuh.
- Display: iPhone4S has retained the amazing Retina display feature of iPhone4.Retina display is a mind-blowing feature of iPhone4S,due to which whatever you see,watch or play on iPhone4S appears to you extraordinarily fine in quality and resolution due to the enormously high number of pixels employed by this feature of iPhone4S.That's because of Retina display that pixel density of the image or video on iPhone4S is so high that human eye cannot distinguish individual pixels and text in books,web pages and email look extraordinarily sharp and crisp at any size .The Retina display feature for iPhone4 and iPhone4S is due to achieving the pixel density of 326 pixels per inch with pixels being only 78 micrometers wide.Due to the IPS (In-plane Switching) Technology that Retina display uses,a wider viewing angle is achieved on iPhone4S than on typical LCDs.The Retina display also includes ambient back lighting and ambient light sensor that intelligently adjusts the brightness of the screen for optimal viewing and battery life.It has 3.5-inch (diagonal) wide screen multi-touch display with 960x640 pixel resolution at 326 ppi.Its display features 800:1 contrast ratio and supports 500cd/m2 maximum brightness.
- Sensors: iPhone4S has four sensors i.e.,three-axis gyro,proximity sensor,accelerometer and ambient light sensor.When you bring the phone close to your ear,the proximity sensor turns off the display to save power and accidental dialling.The ambient light sensor intelligently adjusts the brightness of the display screen for optimal viewing and battery life.Three-axis gyro is for motion-sensing.The accelerometer is for sensing the orientation of the phone so that depending upon its orientation the phone may switch between portrait mode and landscape mode.
- FaceTime: FaceTime is a feature of iPhone4S that lets you hear the voice and see the face that goes with it.You can make a FaceTime call from iPhone to iPhone,iPad,iPod touch or Mac over Wi-Fi.Which is as easy as just making a phone call.Siri,on iPhone4S has made it much easier,whenever you want to make a FaceTime call to anybody just tell Siri.The front camera above the display of iPhone4S is tuned to FaceTime.
These are some salient features of iPhone4S,further details about iPhone4S may be found at the official website of Apple.The iPhone4s is equipped with so many mid-blowing features and functions that we can say that iPhone4S is a masterpiece of cutting-edge and advanced mobile,computer and software technology.iPhone4S is simply marvellous!
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