The iPhone 4S is a touchscreen slate smartphone developed by Apple Inc. It is the fifth generation of the iPhone, a device that combines the 3.5-inch (89 mm) iPod Touch with mobile phone capability. It retains the exterior design of its predecessor, the iPhone 4, but is host to a range of improved hardware specifications and software updates. Integrated software and hardware changes support the introduction of new user interface and functions by Apple, including the voice recognizing and talking assistant called Siri, personal computer independence, cloud-sourced data (iCloud) and an improved camera system. A selection of the device's functions may be voice-controlled.
The iPhone 4S retains almost all of the same design features as its predecessor, the iPhone 4.The front and back are both flat, the screen being made of glass. There is a camera on the back and the sides are stainless steel with metal buttons. It keeps the 3.5 inch (8.89 cm) screen of past iPhones with the "home" button at the bottom.
The iPhone 4S comes in two colors, black and white. It is an amalgamation of a hand-held computer, cell-phone, GPS, digital/video camera, and music player into one device, powered by a rechargeable 1432mAh lithium-polymer battery.
The camera on the iPhone 4S can shoot 8 MP stills (3264 by 2448 pixels) and record 1080p videos at 30 frames per second with upgraded quality[38] (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 camera can now be accessed directly from the lock screen, and the volume up button 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.
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 section 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 pointed out by Apple video messages, is that it is much easier and/or possible 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.
