Jobs details iPhone OS 4 (photos)

Steve Jobs takes the stage at Apple headquarters in Cupertino, Calif., to give a preview of iPhone OS 4, which will be available later this summer.

Giving guests and the media a preview of the iPhone OS 4 software set to be released this summer, Steve Jobs, Phil Schiller, and Scott Forstall took the stage Thursday at Apple headquarters to show off a few of the 100 new features.

The updated software will most notably allow apps to run in the background, without any slowing of performance, Apple said. Multitasking will not be available on the iPhone 3G because of hardware constraints, and Jobs conceded, "We weren't the first to this party, but we're going to be the best." At the end of the morning, during the question-and-answer period, Jobs added, "If you need to use a task manager, you're doing it wrong."

Read more on the new iPhone OS 4 features here, and see the full gallery of images from the day here.

An iPhone can quickly become inundated with pages and pages of app icons. In iPhone OS 4, users will be able to organize groups of apps into folders.

(Credit: James Martin/CNET)

The upgrades to the iPhone OS include multitasking, background audio, background location, voice over IP, a new folders feature, and the new iAd mobile-advertising platform.

(Credit: James Martin/CNET)

With the new iAd advertising platform being released by Apple in iPhone OS 4, Jobs says they hope to enable rich advertising which exists at the intersection of interaction and emotion.

(Credit: James Martin/CNET)

Following the presentation, Apple CEO Steve Jobs and Senior Vice Presidents Phil Schiller and Scott Forstall come together onstage for a question-and-answer session.

(Credit: James Martin/CNET)

Schiller, Jobs, and Forstall onstage at 1 Infinite Loop in Cupertino, Calif., on Thursday during the launch of the iPhone OS 4 software.

(Credit: James Martin/CNET)