iPhone is a line of smartphones designed and marketed by Apple Inc. They run Apple's iOS mobile operating system. The first-generation iPhone was released on June 29, 2007, and multiple new hardware iterations with new iOS releases have been released since.

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 take photosplay music, send and receive emailbrowse the web, send and receive text messages, follow GPS navigation, record notes, perform mathematical calculations, and receive visual voicemailShooting video also became a standard feature with the iPhone 3GS. Other functionality, such as video games, reference works, and social networking, can be enabled by downloading mobile apps.

As of January 2017, Apple's App Store contained more than 2.2 million applications available for the iPhone.