Sony Xperia Z Ultra C6833 Factory Unlocked International Version No Warranty LTE LTE 800 / 850 / 900 / 1700 / 1800 / 1900 / 2100 / 2600 3G 850/1900/1700/900/2100 White Sony Xperia Z Ultra C6833 Factory Unlocked International Version No Warranty LTE LTE 800 / 850 / 900 / 1700 / 1800 / 1900 / 2100 / 2600 3G 850/1900/1700/900/2100 White Unlocked cell phones are compatible with GSM carriers such as AT&T and T-Mobile, but are not compatible with CDMA carriers such as Verizon and Sprint. This cell phone may not include a US warranty as some manufacturers do not honor warranties for international version phones. Please contact the seller for specific warranty information.