Android 5.1 Operation System. Phone size: 166.9*84.2*7.9 mm (L*W*H).</br>Quad Core?? dual Standby?? dual SIM card slots. Pls make sure your card is postpaid card. Work with postpaid card. 3G - 850/2100?? 2G -850/900/1800/1900. US compatibility Nationwide on all GSM Networks including AT&T?? T-Mobile?? Cricket?? MetroPCS?? Straight Talk?? Pure Talk USA and others. Will not work with CDMA Carriers like Sprint?? Verizon?? Boost or Virgin.</br>Multi-function. G-sensor?? Bluetooth?? GPS?? Wifi?? Personal Hotspot?? MP3 player?? Mp4 player?? Gallery?? Sound Recorder?? Videos?? FM Radio?? Torch?? Google Search?? Gmail?? Play store etc.</br>Dual camera. Back camera is 2.0MP with flash light; Front camera is 2.0MP.</br>Please search ".</br></br>Product Description</br></br><b>Note:</b><br><br> - Pls make sure your card is postpaid card. Check with your carrier / provider before purchasing this item.<br> - Unlocked world GSM phone. 3G - 850/2100?? 2G -850/900/1800/1900. Compatible with at&t?? T-Mobile?? Straight Talk?? Simple Mobile and other GSM networks.<br> - Unlocked cell phones will not work with CDMA Carriers like Sprint?? Verizon?? Boost or Virgin.<br><br> <b>Features:</b><br><br> Android 5.1 Operation System. Phone size: 166.9*84.2*7.9 mm (L*W*H). <br> Quad cores?? dual Standby?? dual SIM card slots