Generic 4" Inch Unlocked Dual Sim 3g/2g GPS Smartphone Android 4.2.2 H20 White. Black MT6572W (Dual core 1.3 Ghz Processor) 2G: GSM 850/900/1800/1900MHz 3G: WCDMA 850/2100MHz Android 4.2.2 RAM: 512MB ROM: 4GB GPS 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.