On October 4, 2011, in Cupertino, California, Apple announced the iPhone 4S. On October 7, 2011, it became available for preorder 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.
It is available for 100 cell service carriers in 70 countries, including eight carriers in the United States. For US customers, unlocked (contract-free) sales started on November 11, 2011. The Associated Press said that AT&T described early iPhone 4S demand as "extraordinary". 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.
Software
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 uses iOS 5.1.1, which was released on May 7, 2012. It can act as a hotspot, sharing its internet connection over WiFi, Bluetooth, or USB, and also accesses the App Store, a digital application distribution platform for iOS developed and maintained by Apple. The service allows users to browse and download applications from the iTunes Store that were developed with Xcode and the iOS SDK and were published through Apple. From the App Store, GarageBand, iMovie, iPhoto, and the iWork apps (Pages, Keynote, and Numbers) are available for purchase to use on the iPhone.
The 4S comes with several applications by default, including Safari, Mail, Photos, Video, YouTube, Music, iTunes, App Store, Maps, Notes, Calendar, Game Center, Photo Booth, and Contacts. Like all iOS devices, the 4S can sync with a Mac or PC using iTunes, although iOS 5 and later can be completely PC-free. Although the 4S is not designed to make phone calls over a cellular network, a user can use a wired headset or the built-in speaker and microphone and place phone calls over Wi-Fi or cellular using a VoIP application.
The 4S access 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.
The iPhone 4S introduced a new automated voice control system called "Siri", unique to the 4S, that allows the user to give the iPhone commands, which it can execute and respond to. For example, iPhone commands such as "What is the weather going to be like?" will generate a response such as "The weather is to be cloudy and rainy and drop to 54 degrees today". These commands can vary greatly and control almost every application of the phone. The commands given do not have to be specific and can be used with natural language. Siri can be accessed by holding down the home button for an extra amount of time (compared to using the regular function). An impact of Siri, as shown by Apple video messages, is that it is much easier for people to use device functions while driving, exercising, or when they have their hands full. It also means people with trouble reading, seeing, or typing can access the phone more easily.
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.
At announcement, plans were in place for the iPhone 4S to support many languages. Different features have different language requirements, such as keyboards compared to the word predictor and spell-checker, which needs a large dictionary of words. Language support is related to the iOS 5 operating system that the device launched with, although not always. The Siri digital assistant supported French, English, and German at launch. Since it uses a software based keyboard supported by the multi-touch display, it can support many different keyboard layouts without having to change physically. The iPhone 4S can display different languages and scripts at the same time.
Hardware
The 4S uses the Apple A5 system-on-a-chip that uses an Imagination Technologies PowerVR SGX graphics processing unit, which 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' predecessor, the iPhone 4. However, the iPhone 4S uses a dual-core model, the SGX543, 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 was corroborated by Epic Games president Mike Capps.
It has 512 MB of DDR2 (Double Data Rate) RAM (random-access memory). Maximum available storage size increased to 64 GB whilst the 32 GB and 16 GB model options were retained. The screen is the same as the prior generation iPhones; 3.5 inches (89 mm), 640×960 resolution (Apple's "retina" design).There was an improvement in interactive multimedia applications compared to its predecessor.
In both the iPhone 4 and 4S, the cellular (GSM) antenna is divided into two. Therefore, if the iPhone 4S is gripped in such a way as to attenuate one piece of the cellular antenna, the radio will switch to the other piece that isn't being gripped.The iPhone 4S can support a maximum output theoretically of up to 14.4 Mbps with HSDPA+ (AT&T Only) as a result of an upgraded radio chip inside the phone, in addition to being a world phone, so both CDMA and GSM customers can roam internationally on GSM networks. It also supports Bluetooth 4.0.
The camera on the iPhone 4S, also known as an iSight camera, can take 8 megapixel photos (3264 by 2448 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).
In iOS 5.1, the camera can be accessed directly from the lock screen, and the volume up button doubles as a shutter trigger. The built-in gyroscope is able to stabilize the camera while recording video. 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.
Like the iPhone 4, the 3.5 inches (89 mm) 960 by 640 pixel Retina display supports multitouch, a technology that allows multiple simultaneous touch inputs. The iPhone 4S 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 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 such as H.264 (1080p 30 fps max.), MPEG-4 video, and motion JPEG (M-JPEG).
In addition to user inputs, the device also has several sensors that give the phone information about its orientation and external conditions. These include a 3-axis gyrometer, an accelerometer, a proximity sensor, and an ambient light sensor. The iPhone 4S is stated to have 200 hours standby time (iPhone 4 300 hours), 8 hours talk time on 3G (iPhone 4–7 hours), 14 hours talk time on 2G, 6 hours 3G browsing, and 9 hours Wi-Fi browsing. Additionally, it can sustain up to 10 hours of video playback or 40 hours of audio playback.
The iPhone 4S was unveiled at Apple's "Let's Talk iPhone" event on October 4, 2011, on the Apple Campus in Cupertino, California.The keynote was the first in which Tim Cook led since the Verizon keynote earlier in the year. It was also Cook's first product launch without Apple co-founder, Steve Jobs, whose health was deteriorating and died the day after the announcement of iPhone 4S.
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