LAUDE MayUnlocked S500 5" qHD MT6582 1.3GHz Quad Core Dual SIM CPU Android 4.2.2 GSM 3G Smart Phone 5MP Camera 1GB RAM 4GB ROM Smart Sensor,, White Please open back case to remove the insulating tape on battery before startup! LAUDE MAY S500: 5 inch qHD Big screen, synchronization display to other devices with WiFi Dispaly function, Android 4.2.2OS, MTK6582 Cortex-A7 Quad-core processor + 1GB RAM and 4GB ROM store Smart Sensor You can put your face close to the screen on SMS interface to make a quick calling, Sway your finger upon the distance sensor to unlock, take photos, turn page, change songs and browse pictures. Supports quick answering the call by swaying your finger upon the distance sensor in car mode, Up to 1080P FHD video recording for horizontal/vertical auto-switching visual enjoyment, Supports Google Navigation, built-in GPS navigation with A-GPS assisted Built-in Google Play Store,Google Play installed with original Google Mobile Service, convenient to download and enjoy the Play Music, Chrome, Youtube and others. This Cell Phone works with 3G & 2G networks, Compatible 3G network: WCDMA 850/2100MHz, Compatible 2G Networks: GSM 850/900/1800/1900MHz Installed Apps: Gmail, Audio Player, Google Play Store, Google Map, Google Navigation, Flashlight, Email, Clock, Calendar, Calculator, Notebook, World Clock, Stopwatch, Unit Converter, Currency Converter, Browser, etc. 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.