The WSJ’s Daisuke Wakabayashi interviewed Greg Christie, one of the original iPhone engineers, about the creation of the device that launched seven years ago.

In late 2004, Mr. Christie was working on software for Apple’s Macintosh computers when Scott Forstall, a senior member of the company’s software team, walked into his office, closed the door and asked if he wanted to work on a secret project, codenamed “purple.” The team would develop a phone with an integrated music player, operated by a touch screen.

There are some new anecdotes to me in the interview, as well as a photo of a system Apple created to test the iPhone software in 2006 (it’s big and clunky as you imagine). You can read the interview here.

See also: Andy Grignon’s story.