Padgene [Update Version] Vogue 6" Android 5.1 Unlocked Smartphone, 4 Core, Dual Sim, Dual Camera, 2G / 3G GSM Touchscreen Smartphone, Gold Android 5.1 Operation System. Phone size: 165.5* 84.8*8.5mm. (L*W*H). 4 core, dual Standby, dual SIM card slots. 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. 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. Dual camera. Back camera is 5.0MP with flash light; Front camera is 2.0MP. How to install SIM card? http://v.youku.com/v_show/id_XMTQyMjcxNjUxNg==.html