The iPhone is a line of Internet and multimedia-enabled smartphones designed and marketed by Apple Inc. The first iPhone was introduced on January 9, 2007 and the latest iPhone generation announced on September 9, 2015 includes two models iPhone 6S and iPhone 6S Plus , iPhone 7 and 7 Plus is rumored to be released this year. An iPhone functions as a camera phone, including text messaging and visual voicemail, a portable media player, and an Internet client, with e-mail, web browsing, and Wi-Fi connectivity. The user interface is built around the device's multi-touch screen, including a virtual keyboard rather than a physical one.
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There have been nine generations of iPhone hardware, and they have been accompanied by four major releases of iOS (formerly iPhone OS). The original iPhone established design precedents like screen size and button placement that have persisted through all models. The iPhone 3G brought 3G cellular network capabilities and A-GPS location. The iPhone 3GS brought a compass, faster processor, and higher resolution camera, including video. The iPhone 4 has two cameras for FaceTime video calling and a higher resolution display. iPhone 5 features the dual-core A6 processor, increases the size of the Retina display to 4 inches, introduces LTE support and replaces the 30-pin connector with an all-digital Lightning connector. The iPhone 5C features the same A6 chip as the iPhone 5, along with a new backside-illuminated FaceTime camera and a new casing made of polycarbonate. The iPhone 5S features the dual-core 64-bit A7 processor, an updated camera with a larger aperture and dual-LED flash, and the Touch ID fingerprint scanner, integrated into the home button, and fitness tracking facilities. The iPhone 6 and iPhone 6 Plus further increased screen size, measuring at 4.7 inches and 5.5 inches, respectively.
Hardware - Screen and input: The screen is the dominant feature of the front of the iPhone, and is the main method of user interaction. The touchscreen is a 9 cm liquid crystal display (320×480 px at 6.3 px/mm, 163 ppi, HVGA) with scratch-resistant glass, and 18-bit color (rendering 262,144 colors). The capacitive touchscreen is designed for a bare finger, or multiple fingers for multi-touch sensing. The iPhone 6S and 6S Plus, introduced in 2015, feature "force-touch" displays which allows the screen to recognise how hard it is being pressed. An example of how this technology will be used is lightly pressing the screen to preview a photograph and pressing down to take it.
Audio and output: One of two speakers (left) and the microphone (right) surround the dock connector on the base of the original iPhone. If a headset is plugged in, sound is played through it instead.The bottom of the iPhone sports a speaker (left) and a microphone (right) flanking the dock connector. The iPhone 4 includes an additional microphone at the top of the unit for noise cancellation, and switches the placement of the microphone and speaker on the base on the unit-the speaker is on the left. Volume controls are located on the left side of all iPhone models and as a slider in the iPod application.
An iPhone 3G with the SIM slot open. The SIM ejector tool is still placed in the eject hole.The iPhone was initially released with two options for internal storage size: 4 GB or 8 GB. On September 5, 2007, Apple discontinued the 4 GB models. On February 5, 2008, Apple added a 16 GB model. The iPhone 3G was available in 16 GB and is still available with 8 GB. The iPhone 3GS comes in 16 GB and 32 GB variants. The latest iPhone 6S/6S Plus has 16 GB, 64 GB and 128 GB storage options.
The default Home screen of iOS 9 shows most of the applications provided by Apple. Users can download additional applications from the App store, create Web Clips, rearrange the icons, and create folders.The iPhone runs an operating system known as iOS (formerly iPhone OS). It is a variant of the same Darwin operating system core that is found in Mac OS X. Also included is the "Core Animation"; software component from Mac OS X v10.5 Leopard.
Audio playback: Frequency response: 20Hz to 20,000Hz
Audio formats supported: AAC, Protected AAC (from iTunes Store), HE-AAC, MP3 (8 to 320 Kbps), MP3 VBR, Audible (formats 2, 3, 4, Audible Enhanced Audio, AAX, and AAX+), Apple Lossless, AIFF, and WAV
User-configurable maximum volume limit
Video formats supported: H.264 video up to 720p, 30 frames per second, Main Profile level 3.1 with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats; MPEG-4 video, up to 2.5 Mbps, 640 by 480 pixels, 30 frames per second, Simple Profile with AAC-LC audio up to 160 Kbps per channel, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats; Motion JPEG (M-JPEG) up to 35 Mbps, 1280 by 720 pixels, 30 frames per second, audio in ulaw, PCM stereo audio in .avi file format.
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