BLU Studio Selfie 2 - GSM Unlocked Smartphone - Gold Unlocked Dual SIM smartphone, Android 5.0 Lollipop with Immediate Upgrade to Android 6.0 Marshmallow 5.0" IPS display; 5MP Autofocus Main Camera with LED flash and 5MP Front Camera 8GB Internal memory 1GB RAM Micro SD up to 64GB 3,000 mAh super battery with Mediatek Quad Core 1.3 GHz Processor with arm Mali-400 GPU 4G HSPA+ (850/1700/1900/2100). GSM Quad band: US compatibility Nationwide on all GSM Networks including AT&T, T-Mobile, Cricket, MetroPCS, Straight Talk USA, Pure Talk USA and others