The pioneering iPhone (1st Gen) was a revolutionary handheld device that merged the functions of a mobile phone, an iPod, and an internet communicator. As a Quad-band GSM phone, it operated on 850, 900, 1800, and 1900 MHz frequencies. It showcased a 3.5-inch display with a 320x480 resolution at 163 ppi and was offered with 4 GB, 8 GB, or 16 GB of flash storage (the 4 GB model was discontinued on September 5, 2007, and the 16 GB version was introduced on February 5, 2008). The device included built-in support for Wi-Fi (802.11b/g), EDGE, and Bluetooth 2.0, along with an integrated 2.0-megapixel camera, all housed in a sleek case just 0.46 inches thick and weighing 4.0 ounces.
Initially, Apple announced battery life as "up to" 16 hours of audio and 5 hours of "talk, video, and browsing." However, on June 18, 2007, these figures were updated to "up to" 8 hours of talk time, 24 hours of audio, 7 hours of video, and 6 hours of web browsing, with a standby time of up to 250 hours.
One of its most groundbreaking features was the "multi-touch" interface, which allowed users to control system functions by dragging one or more fingers across the "optical quality" glass display.
Additionally, the original iPhone included an accelerometer that enabled the device to detect its orientation and automatically switch between portrait and landscape modes, an ambient light sensor to adjust screen brightness as needed, and a proximity sensor to deactivate the display when held to the ear.