ZHYIHONG&reg; Android 5.1 Smartphone 6.0" GSM Unlocked (White) Unlocked Dual SIM smartphone, with Android 5.1 Lollipop Mediatek 6580 Quad Core 1.3 GHz Processor with arm Mali-400 GPU 6.0 Inch TFT, capacitive touch screen 960 x 540 pixels Dual cameras Front 0.3 MP Back 5.0 MP Dual SIM,RAM:512MB;ROM:4GB 3G (WCDMA 850/2100) and 2G Quad Band International Version (GSM 850/900/1800/1900) network of US Compatible Nationwide on all GSM Networks including AT&T, T-Mobile, H20,Cricket, Tracfone, Straight Talk and others T-Mobile: Lyca, Speedtalk, Go Smart, Simple Mobile, Net10, Straight Talk, Solavei, Ultra Mobile, Telcel America, Walmart Family Mobile. Note:A SIM card need to be purchased separately. Some network company provide the GSM/WCDMA sim card and CDMA sim card also, please buy the GSM/WCDMA SIM card. Do not buy the CDMA SIM card from them.