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The Samsung Galaxy S4 is an Android smartphone produced by Samsung Electronics. First unveiled on March 13, 2013 at Samsung Mobile Unpacked in New York City, it is a successor to the Galaxy S III which maintains a similar design, but with upgraded hardware and an increased focus on software features that take advantage of its hardware capabilities—such as the ability to detect when a finger is hovered over the screen, and expanded eye tracking functionality (which includes scrolling). A hardware variant of the S4 also became the first smartphone to support the emerging LTE Advanced mobile network standard.
The S4 was made available in late April 2013 on 327 carriers in 155 countries. Upon its release, it became the fastest selling smartphone in Samsung's history; the company sold 20 million S4 units worldwide in the two months following the device's launch. Samsung has since sold more than 40 million units.
The S4 uses a refined version of the hardware design introduced by the S III, with a rounded, polycarbonate chassis and a removable rear cover. It is slightly lighter and narrower than the S III, with a length of 136.6 mm (5.38 in), a width of 69.8 mm (2.75 in), and a thickness of 7.9 mm (0.31 in). At the bottom of the device is a microphone and a microUSB port for data connections and charging; it also supports USB-OTG and MHL 2.0. Near the top of the device are a front-facing camera, along with infrared, proximity, and ambient light sensors, and a notification LED. In particular, the infrared sensor is used for the device's "Air View" features. A headphone jack, secondary microphone, and infrared blaster are located at the top. The S4 is widely available in black and white color finishes; in selected regions, Samsung also introduced versions in red, purple, pink, brown with gold trim, and light pink with gold trim. In late-January 2014, Samsung's Russian website briefly listed a new black model with a plastic leather backing, similar to the Galaxy Note 3. The S4's display is larger than its predecessor, with a 5-inch (130 mm), 1080p PenTile RGBG Super AMOLED screen with a resolution of 441 PPI, and Corning Gorilla Glass 3. Unlike previous models, the S4 does not contain FM radio support, citing the increased use of online media outlets for content consumption on mobile devices.
Galaxy S4 models use of one of two processors, depending on the region and network compatibility. The S4 version for North America, most of Europe, parts of Asia, and other countries contains Qualcomm's Snapdragon 600 system-on-chip, containing a quad-core 1.9 GHz Krait 300 CPU and an Adreno 320 GPU. The chip also contains a modem which supports LTE. Other models include Samsung's Exynos 5 Octa system-on-chip with a heterogeneous CPU. The octa-core CPU comprises a 1.6 GHz quad-core Cortex-A15 cluster and a 1.2 GHz quad-core Cortex-A7 cluster. The chip can dynamically switch between the two clusters of cores based on CPU usage; the chip switches to the A15 cores when more processing power is needed, and stays on the A7 cores to conserve energy on lighter loads.
On 24 June 2013, a variant supporting LTE Advanced, the first commercially-available device to do so, was announced for South Korea.
The S4 comes with either 16 GB, 32 GB or 64 GB of internal storage, which can be supplemented with up to an additional 64 GB with a microSD card slot. The S4 contains a 2600 mAh, NFC-enabled battery.