Unnecto Quattro X Smartphone - Unlocked (Black) Unlocked Dual SIM Phone, Dual Core 1.2 GHz Processor, 5MP Main Camera 1.0 MP Front camera, LED Flash High Dynamic Range (HDR) Photos, Face/Smile Detection, Panorama Capable 4.0" HVGA IPS Capacitive Touch screen 4G HSPA + 21Mbps GSM 850/900/1800/1900 HSDPA 850 / 1900/2100 Nationwide AT&T: Cricket Wireless, Trachoma, Straight Talk, Net10, H20 Wireless, 420 Wireless, Black Wireless, Consumer Cellular Pure Taluks, Red Pocket, Telco America. T-Mobile: Metrics, Lycia, Speed talk, Go Smart, Simple Mobile, Net10, Straight Talk, Slave, Ultra Mobile, Telco America, Walmart Family Mobile. Pure Taluks 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.