|iPhone 3 G Availability|
|Apple's iphone Sales Chart|
Development of the iPhone began with Apple CEO Steve Jobs' direction that Apple engineers investigate touchscreens.[Apple created the device during a secretive and unprecedented collaboration with AT&T Mobility—Cingular Wireless at the time,at an estimated development cost of US$150 million over thirty months.Apple rejected the "design by committee" approach that had yielded the Motorola ROKR E1, a largely unsuccessful collaboration with Motorola. Instead, Cingular gave Apple the liberty to develop the iPhone's hardware and software in-house.
On July 11, 2008, Apple released the iPhone 3G in twenty-two countries, including the original six.Apple released the iPhone 3G in upwards of eighty countries and territories.Apple sold 6.1 million original iPhone units over five quarters. The sales has been growing steadily thereafter, by the end of fiscal year 2010, a total of 73.5 million iPhones were sold.
The touchscreen is a 9 cm (3.5 in) liquid crystal display with scratch-resistant glass. The capacitive touchscreen is designed for a bare finger, or multiple fingers for multi-touch sensing. The screens on the first three generations of the iPhone have a resolution of 320 x 480 (HVGA) at 163 ppi, while the display on the iPhone 4 has a resolution of 640 x 960 at 326 ppi.
The touch and gesture features of the iPhone are based on technology originally
developed by FingerWorks. Most gloves and styluses prevent the necessary electrical conductivity;however, capacitive styli can be used with iPhone's finger-touch screen. The iPhone 3GS also features a fingerprint-resistant oleophobic coating.