Form factor Touchscreen smartphone
Dimensions 115.2 mm (4.54 in) H
58.66 mm (2.309 in) W
9.3 mm (0.37 in) D
Weight 140 g (4.9 oz)
Operating system Original OS: iOS 5.0
CPU Approximately 800 MHz dual-core ARM Cortex-A9
GPU PowerVR SGX543MP2
Memory 512 MB DDR2 RAM
Storage 16, 32, or 64 GB
Battery 3.7 V, 5.3 Wh (1,430 mAh)
Data inputs Multi-touch touchscreen display
4 button switch
Dual microphone
3-axis gyroscope
3-axis accelerometer
Digital compass
Proximity sensor
Ambient light sensor
Display 3.5 in (89 mm) diagonal 1.5:1 aspect ratio widescreen
LED backlit IPS TFT LCD
640×960 resolution at 326 ppi (0.61 MP)
800:1 contrast ratio (typical)
500 cd/m2 max. brightness (typical)
Fingerprint-resistant oleophobic coating on front and back glass
Rear camera 8 MP back-side illuminated sensor
HD video (1080p) at 24/30 frame/s
IR filter
Aperture f/2.4
5 element lens
Image signal processor (built-in A5)
Facial recognition (stills only)
image stabilization
Front camera 0.3 MP VGA 30 FPS (480p)
Connectivity
Wi-Fi (802.11 b/g/n) (2.4 GHz only)
Bluetooth 4.0
Combined GSM/CDMA antenna: quad-band GSM/GPRS/EDGE
(800 850 900 1,800 1,900 MHz)
Quad-band UMTS/HSDPA/HSUPA
(800 850 900 1,900 2,100 MHz) (800 MHz unannounced)
Dual-band CDMA/EV-DO Rev. A (800 1,900 MHz)
GLONASS, Global Positioning System (GPS)
Website apple.com/iphone/iphone-4s/specs.html
The iPhone 4S is a touchscreen-based smartphone developed by Apple Inc. It is the fifth generation of the iPhone, succeeding the iPhone 4, and was announced on October 4, 2011. It became available for pre-order on October 7, 2011 in seven initial countries (United States, Canada, Australia, United Kingdom, France, Germany and Japan) with the first delivery date set for October 14, 2011, and available on that same day for direct in-store sales in those countries. It was released in 22 more countries, including Ireland, Mexico, and Singapore, on October 28.
The phone retains the exterior design of its predecessor, but hosts improved hardware specifications and software updates. It added a voice recognition system known as Siri from which the "4S" designator came, and a cloud storage service named iCloud. Some of the device's functions may be voice-controlled through Siri. The phone is available for 100 cell service carriers in 70 countries, including eight carriers in the United States. Reception to the iPhone 4S was generally favorable. Reviewers noted Siri, the new camera, and processing speeds as significant advantages over the prior model. Four million units of the iPhone 4S were sold in the first three days of release.
The iPhone 4S was unveiled at Apple's "Let's Talk iPhone" event on October 4, 2011,
At the "Let's Talk iPhone" event held by Apple on October 4, 2011, Mike Capps demonstrated Epic Games' Infinity Blade II, the sequel to Infinity Blade, on an iPhone 4S. Capps boasted that the game uses Epic Games' Unreal Engine 3 and features the same graphic techniques used in the Xbox 360 game Gears of War 3.
The iPhone 4S uses iOS, Apple's mobile operating system. The user interface of iOS is based on the concept of direct manipulation, using multi-touch gestures. Interface control elements consist of sliders, switches, and buttons. The response to user input is immediate and provides a fluid interface. Interaction with the OS includes gestures such as swipe, tap, pinch, and reverse pinch, all of which have specific definitions within the context of the iOS operating system and its multi-touch interface. Internal accelerometers are used by some applications to respond to shaking the device (one common result is the undo command) or rotating it in three dimensions (one common result is switching from portrait to landscape mode).
The 4S can play music, movies, television shows, ebooks, audiobooks, and podcasts and can sort its media library by songs, artists, albums, videos, playlists, genres, composers, podcasts, audiobooks, and compilations. Options are always presented alphabetically, except in playlists, which retain their order from iTunes. The iPhone uses a large font that allows users plenty of room to touch their selection. Users can rotate their device horizontally to landscape mode to access Cover Flow. Like on iTunes, this feature shows the different album covers in a scroll-through photo library. Scrolling is achieved by swiping a finger across the screen. Alternatively, headset controls can be used to pause, play, skip, and repeat tracks. On the 4S, the volume can be changed with the included Apple Earphones, and the Voice Control feature can be used to identify a track, play songs in a playlist or by a specific artist, or create a Genius playlist.
On the iPhone 4S, texting can be aided by the voice assistant, which allows speech-to-text.In addition to regular texting, messaging on the iPhone 4S is supported by iMessage, a specialized instant messaging program and service that allows unlimited texting to other Apple iOS 5 products. This supports the inclusion of media in text messages, integration with the device's voice controlled software assistant, and read receipts for sent messages. Input to the computer comes from a keyboard displayed on the multi-touch screen or by voice-to text by speaking into the microphone. Entered text is supported by predictive and suggestion software as well as a spell-checker, that includes many regional dialects like Swiss spoken French.
The iPhone 4S uses the Apple A5 system-on-a-chip (SoC) that incorporates an Imagination Technologies PowerVR SGX543 graphics processing unit (GPU). This GPU features pixel, vertex, and geometry shader hardware supporting OpenGL ES 2.0. The SGX543 is an improved version of the GPU used in the iPhone 4S's predecessor, the iPhone 4. The iPhone 4S uses a dual-core model that is integrated with the Apple A5 SoC in the same way as the iPad 2. Apple claims that the iPhone 4S can process graphics "up to seven times faster" than the iPhone 4; this was corroborated by Epic Games president Mike Capps.
The iPhone 4S has 512 MB of DDR2 RAM. Maximum available storage size increased to 64 GB while the 32 GB and 16 GB model options were retained. The screen is the same as the prior generation iPhone's; 3.5 inches (89 mm), 640×960 resolution (Apple's "retina" design). There was an improvement in interactive multimedia applications compared to its predecessor.
The camera on the iPhone 4S, also known as an iSight camera, can take 8 megapixel photos (3,264 by 2,448 pixels) and record 1080p videos at up to 30 frames per second with upgraded quality (30% better clarity, 26% better white balance, color accuracy) due to an additional lens, IR filter, a wider f/2.4 aperture, and Image signal processor (built-in A5).
The built-in gyroscope allows for some image stabilization for the camera while recording video, although it still has room for improvement, since state-of-the-art image stabilization algorithms do not need to use a gyroscope, but use image processing. Other features of the camera are macro (for close up pictures) and faster capture including being able to take its first picture in 1.1 seconds and the next half a second later.
The iPhone 4S features a 3.5 inches (89 mm) 960 by 640 pixel multitouch Retina display. It has two volume buttons and a ring/silent switch on the left side. On the top left there is a 3.5 mm headphone jack and a microphone that is used for both noise cancellation during calls and when in speakerphone/FaceTime (video calling) mode. The lock/power button is situated on the top right edge of the device. The right side of the device has a Micro-SIM card slot. The bottom of the device features a speaker output on the right and a microphone input on the left with Apple's proprietary 30-pin dock connector in the center. The iPhone 4S supports video out via AirPlay and various Apple A/V cables. Supported video formats include H.264 (1080p 30 frames per second maximum), MPEG-4 video, and motion JPEG (M-JPEG).
The iPhone 4S has a stainless steel, dual cellular antenna design. Apple redesigned the antenna in the iPhone 4S after some original iPhone 4 users reported cellular signal attenuation problems as a result of holding the phone in certain positions. The improved cellular radio in the phone can switch between two antennas, depending on which is sending/receiving the best signal. These two antennas are incorporated into the distinctive stainless steel band that wraps around the sides of the iPhone 4S. The bands on the iPhone 4S are divided into two antennas: cellular and Global Positioning System GPS, with Bluetooth and Wi-Fi reliant on an internal antenna.The iPhone 4 and 4S were designed by Jonathan Ive. The '4' generation iPhones differ from earlier Apple designs; the bulges of the back panel as well as the band between the front and back are gone and have been replaced with flattened surfaces. The redesign reflects the utilitarianism and uniformity of existing Apple products, such as the iPad and the iMac. The overall dimensions of the iPhone 4S are lower than that of the 3GS.
It is 4.53 inches (115 mm) high, 2.31 inches (59 mm) wide, and 0.37 inches (9.4 mm) deep, compared to the iPhone 3GS, which is 4.55 inches (116 mm) high, 2.44 inches (62 mm) wide, and 0.48 inches (12 mm) deep; making the iPhone 4 and 4S 21.5% thinner than the 3GS. The internal components are situated between two panels of aluminosilicate glass, described by Apple as being "chemically strengthened to be 20 times stiffer and 30 times harder than plastic," theoretically allowing it to be more scratch resistant and durable than the prior models.
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