Motorola C139 Unlocked Cell Phone-U.S. Version with 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. U.S. version dual-band GSM cell phone compatible with 850/1900 frequencies and GPRS capabilities Great for basic voice communication and SMS text messaging iTap predictive text for easy text messaging; organizer with calendar, currency converter and stopwatch Up to 11.67 hours of talk time and 450 hours of standby