The Pre and the operating system use a couple of key concepts to make the phone easy to use, and to tightly integrate it with Internet services for e-mail, instant messaging and search, as well as with Facebook.

For example, the phone organizes multiple active applications using "activity cards," large icons that line up on the display. Using the touch interface, users can flip through them, move them around, or throw them off screen by dragging a finger from the bottom to the top of the screen.

Bringing together multiple data sources into one view is also an important part of the Pre and webOS user experience. Users can, for example, group together Outlook, Google and Facebook calendars or collect e-mail from multiple accounts in one inbox. All conversations with the same person over instant messaging or text messaging are grouped together in one chat-style view.

Things like new text messages and calendar appointments appear as pop-up notifications at the bottom of the screen.

The phone doesn't just use touch; it also comes with a QWERTY keyboard that slides out from the bottom of the phone. When the keyboard slides out, the phone becomes slightly curved. Just using a "cheesy virtual keyboard" doesn't cut it, said Jon Rubinstein, executive chairman at Palm, in a direct dig at his former employer Apple, with its famed iPhone onscreen keyboard.