And while AT&T, Verizon and Sprint are offering the Palm Centro at an attractive $99 price tag, the device maker last month also launched an "unlocked" Centro for $299. The unlocked Centro (pictured) can be used on any wireless carrier that supports quad-band GSM wireless, which operates at 850/900/1800/1900 MHz. And while the unlocked Centro doesn't offer 3G support, it supports 2.5G on the EDGE network.

The unlocked Centro, like the Centros available from the carriers, weighs in at 4.4 ounces and measures 4.2 x 2.1 x 0.73 inches. It features a 320 x 320 resolution touch screen and a full QWERTY keypad. In addition, the Centro features Bluetooth support, a microSD slot for up to 4 GB of expanded memory and a 1.3-megapixel camera with two times zoom and video capture.