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The Samsung Galaxy S4 is an Android smartphone produced by Samsung Electronics as the fourth smartphone of the Samsung Galaxy S series and was first shown publicly on March 14, 2013, at Samsung Mobile Unpacked in New York City. It is the 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, it was released the previous year. A hardware variant of the S4 became the first smartphone to support the emerging LTE Advanced mobile network standard (model number GT-i9506). The T-Mobile version of the Galaxy S4, named the model (SGH-M919), was released the same month. A phone's successor, the Samsung Galaxy S5, was released the next year.

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