Samsung S4 Mini Duos GT-i9192 Black Edition 8GB - Factory Unlocked International Version Samsung S4 Mini Duos GT-i9192 Factory Unlocked 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.