iFixit

The back of the phone and speaker.

The speaker in the Pre is substantially better than the one in the iPhone.

Palm didn't skimp on antennas. They're exposed for all to see as soon as you remove the back panel.

The antenna design is three dimensional to optimize signal quality. The iPhone's antennas also use this technique.

The small sticker labeled palm visible in the third image is probably there to prevent people from doing what we're about to do...