But Apple knows its smartphone well, so users who can afford the Bumper might find it worth the price. It is on Apple's Web site.

Belkin is offering cases between $25 and $30 that could protect the device and prevent the iPhone screen from suffering scratches. The Shield cases protect the iPhone while providing increased shock absorption and impact resistance. The Verve cases are made of leather, which provides a higher level of protection. The Grip cases don't provide as much impact resistance, but ensure a better grip when using the phone. The cases are on Belkin's Web site.

The company also offers screen protectors for the iPhone 4.