Microsoft Lumia 640 XL 8GB White Dual Sim (RM-1096) Unlocked International Model- No Warranty RM-1096. New, DUAL SIM, Unlocked, International GSM model. Will work with GSM networks like AT&T and T-mobile. Will not work with CDMA networks like Verizon or 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. This item may contain a foreign charger. If so, a FREE US adapter will be provided.