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The iPhone (retroactively labeled the original iPhone, iPhone 1) is a smartphone that was designed and marketed by Apple Inc. It is the first generation of iPhone and was announced on January 9, 2007 after months of rumors and speculation.

It was introduced in the United States on June 29, 2007. It featured quad-band GSM cellular connectivity with GPRS and EDGE support for data transfer.

On June 9, 2008, Apple announced its successor, the iPhone 3G. The original iPhone no longer receives software updates from Apple; its final official firmware version was iPhone OS 3.1.3

Steve Jobs, the CEO at Apple Inc., conceived an idea of using a multi-touch touchscreen to interact with a computer in a way in which he could type directly onto the display, essentially removing the physical keyboard and mouse, the same as a tablet computer. Jobs recruited a group of Apple engineers to investigate the idea as a side project. When Jobs reviewed the prototype and its user interface, he conceived a second idea of implementing the technology onto a mobile phone. The whole effort was called the Project Purple 2 and began in 2005.

Apple created the device during a secretive and unprecedented collaboration with AT&T, formerly Cingular Wireless. The development cost of the collaboration was estimated to have been $150 million over a thirty-month period. Apple rejected the "design by committee" approach that had yielded the Motorola ROKR E1, a largely unsuccessful collaboration with Motorola. Instead, Cingular Wireless gave Apple the liberty to develop the iPhone's hardware and software in-house.

The original iPhone was introduced by Steve Jobs on January 9, 2007 in a keynote address at the Macworld Conference & Expo held in Moscone West in San Francisco, California. In his address, Jobs said, "I have been looking forward to this for two and a half years", and that "today, Apple is going to reinvent the phone." Jobs introduced the iPhone as a combination of three devices: a "widescreen iPod with touch controls"; a "revolutionary mobile phone"; and a "breakthrough Internet communicator".