The entire front of the quad-band GSM phone serves as the screen, Jobs told attendees at the MacWorld Expo here this morning. He also noted that the operating system behind the phone's various features is Mac OS X and said that it will sync up with a user's iTunes, plus mail, notes and bookmarks. It will also display visual voice mails.

The phone, whose screen measures 3.5 in. diagonally, plays video and includes a 2-megapixel camera. The screen offers a higher-than-normal resolution of 160 pixels per inch, Jobs said. He also said that the iPhone has a proximity sensor so that when it's held up to a user's ear during a call, the user interface is turned off.

Jobs pointed out that the phone will offer Wi-Fi and Bluetooth wireless connectivity, comes with the company's Safari Web browser and displays Google maps.

The iPhone features a small "Home" button on it. It's also remarkably thin -- at less than half an inch, it's thinner than any smart phone out there, according to Jobs.

On one side, it sports a ring/silent switch and volume up-and-down controls. On its silver back is the digital camera. The bottom features a speaker, microphone and iPod dock connector.