iPhone (/ˈaɪfoʊn/ eye-fohn) is a line of smartphones designed and marketed by Apple Inc. It runs Apple's iOS mobile operating system.^[14] The first generation iPhone was released on June 29, 2007; the most recent iPhones, the seventh-generation iPhone 5Cand iPhone 5S, were introduced on September 10, 2013.

The user interface is built around the device's multi-touch screen, including a virtual keyboard. The iPhone has Wi-Fi and can connect to many different cellular networks, including 1xRTT and GPRS (shown as a circle on the status bar), EDGE (shown as a capital E on the status bar), UMTS and EV-DO (shown as 3G), a faster version of UMTS and 4G (shown as a 4G symbol on the status bar), and LTE (shown as LTE on the status bar).^[15] An iPhone can shoot video (though this was not a standard feature until theiPhone 3GS), take photos, play music, send and receive email, browse the web, send texts, GPS navigation, tell jokes, record notes, do mathematical calculations, and receive visual voicemail.^[16] Other functions — video games, reference works, social networking, etc.

— can be enabled by downloading application programs (‘apps’); as of October 2013, the App Store offered more than one million apps by Apple and third parties.^[17]

There are seven generations of iPhone models, each accompanied by one of the six major releases of iOS. The original 1st-generation iPhone was a GSM phone and established design precedents, such as a button placement that has persisted through all models and a screen size maintained for the next four iterations. The iPhone 3G added 3G cellular network capabilities and A-GPSlocation. The iPhone 3GS added a faster processor and a higher-resolution camera that could record video at 480p. The iPhone 4featured a higher-resolution 960×640 "Retina Display", a VGA front-facing camera for video calling and other apps, and a 5-megapixel rear-facing camera with 720p video capture.^[18] The iPhone 4S upgrades to an 8-megapixel camera with 1080p video recording, a dual-core A5 processor, and a natural language voice control system called Siri.^[19] iPhone 5 features the dual-core A6processor, increases the size of the Retina display to 4 inches, and replaces the 30-pin connector with an all-digital Lightning connector