Sidekick SK 2008 Unlocked Phone with QWERTY Keyboard, Stereo Bluetooth and 2MP Camera - US Warranty - Black This unlocked cell phone is compatible with GSM carriers like AT&T and T-Mobile. Not all carrier features may be supported. It will not work with CDMA carriers like Verizon Wireless, Alltel and Sprint. New Sidekick messaging phone sports a slightly smaller, thinner and lighter design, 2.6-inch high-resolution screen 2-megapixel camera; digital audio player; Bluetooth for handsfree communication and stereo music; MicroSD expansion Horizontal swivel screen and full QWERTY keyboard WQVGA screen with high-definition LCD technology