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iPhone (/ˈaɪfoʊn/ eye-fohn) is a line of smartphones designed and marketed by Apple Inc. They run Apple's iOS mobile operating system.[13] The first generation iPhone was released on June 29, 2007; the most recent iPhone models are the iPhone 6s and iPhone 6s Plus, which were unveiled at a special event on September 9, 2015.[14] 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 cellular networks. An iPhone can shoot video (though this was not a standard feature until the iPhone 3GS), take photos, play music, send and receive email, browse the web, send texts, GPS navigation, record notes, do mathematical calculations, and receive visual voicemail.[15] 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[16] and is ranked as the world's second largest mobile software distribution network of its kind (by number of currently available applications).[17][better source needed]