WG1000 Unlocked Quadband Dual Sim WiFi GPS Android 2.3 OS With 4 Inch Capacitive Touch Screen 3G Smart Phone - AT&T, T-mobile, H20, Simple mobile and other GSM networks (Black) OS: Android 2.3 CPU: Media Tek MTK6573 650MHz Memory: 512 ROM+512MB RAM extend to 16GB max Network Frequency: GSM 850/900/1800/1900MHz WCDMA 2100MHz Dual SIM, Dual Standby