The iphone doesn't relate much to steam, however, there is a steam app for the iphone. The steam app, which lets you trade items, shop for games, and talk to friends, also doubles as a mobile authenticator, which is used to make your steam account more secure. This is important, because some people have hundreds of dollars worth of collectible items on their steam accounts. The iphone was introduced on January 9, 2007, by the CEO of Apple, Steve Jobs at the Moscone Center in San Francisco. The iPhone redefined the category of smartphone. The smartphone revolution was started by the iPhone, and has since put a powerful computer into the hands of people all around the world.