Blackberry - Pearl 8100 - Red Unlocked GSM Phone 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. Unlocked quad-band GSM cell phone compatible with 850/900/1800/1900 frequencies and GPRS/EDGE data capabilities Up to 3.5 hours of talk time, up to 240 hours (10 days) of standby time; measures 4.2 x 1.97 x 0.55 inches (HxWxD)