BLU Studio C 5+5 Smartphone with Lollipop OS- US GSM Unlocked - Black Unlocked Dual Sim Smartphone, with Android 5.0 Lollipop MediaTek Quad Core 1.3 GHz processor with ARM Mali-400 GPU 8GB Internal Memory 1GB RAM Micro SD up to 64GB 5MP Autofocus Main Camera with Led Flash and 5MP Front Camera 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