Samsung Galaxy Ace 4 LTE G313MU Unlocked GSM Dual-Core Smartphone w/ 4G LTE for U.S. - Charcoal Black 2G: GSM 850 / 900 / 1800 / 1900, 3G: HSPA+ 850 / 900 / 1700 / 1900 / 2100, 4G: LTE Cat4 700 / 850 / 1700 (AWS) / 1900 / 2100 4-inch TFT Display Capacitive Multi-Touchscreen Android v4.4.2 (KitKat), Dual-Core 1.0 GHz Processor 5 Megapixel Camera (2592 x 1944 pixels) w/ Autofocus, LED Flash, Face/Smile Detection, Panorama + Front-Facing VGA Camera Internal Memory: 4GB + microSD Slot Expandable up to 64GB Unlocked cell phones are compatible with GSM carriers like AT&T and T-Mobile as well as with GSM SIM cards (e.g. H20, Straight Talk, and select prepaid carriers). Unlocked cell phones will not work with CDMA Carriers like Sprint, Verizon, Boost or Virgin.