Nokia 2135 Unlocked Phone with Dual-Band GSM 850/1900--U.S. Version with Warranty (Silver) 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. Dual-band GSM cell phone compatible with 850/1900 frequencies Clear voice and text messaging capabilities 2.5 mm headphone jack for wired headsets; phonebook with 400 entries Up to 3.5 hours of talk time and 264 hours of standby