Steve Jobs said : "Design is not just what it looks like and feels like. Design is how it works!"

The first iPhone was released on June 29, 2007 and the most recent iPhone, the sixth-generation iPhone 5, was released on September 21, 2012.

Apple's iPhone is the most popular phone in U.S. because of the elegant and intuitive interface and amazing features and build-in apps.

An iPhone can shoot video, take photos, play music, send and receive email, browse the web, send texts, and receive visual voicemail. Other functions—games, reference, GPS navigation, social networking, etc.—can be enabled by downloading apps. As of 2012, the App Store offered more than 700,000 apps by Apple and third parties.

Tell us about your experiences with your iPhone by leaving a comment.