BLU Studio 5.5 HD - US GSM Unlocked - Black Unlocked Dual Sim Smartphone, with Android 5.1 Lollipop 5.5 HD IPS Display: 5MP Autofocus Main Camera 2581x1936 pixels + 5MP Front Camera with LED flash 8GB Internal Memory 1GB RAM Micro SD up to 64 GB Mediatek 1.3 GHz Quad Core with Mali-400 GPU GSM Quad Band 4G HSPA+ (850/1700/1900): US Compatibility Nationwide on all GSM Networks including AT&T, T-Mobile, Cricket, MetroPCS, Straight Talk, Pure Talk USA and others