BLU Studio Energy - With 5000 mAH Super Battery - Global GSM- Unlocked Cell Phones (Black) 5,000mAh Super Battery: Go Up to 4 Days on Standard Usage with a Single Charge, or 45 days stand-by. 5.0" HD IPS Display (300ppi), 8MP Main Camera + 2MP Front Camera, MediaTek Quad Core 1.3GHz Processor with ARM Mali-400 GPU Unlocked Dual Sim Phone, Android 4.4 Kit Kat upgradeable to Android 5.0 Lollipop, 8GB Internal Storage 1GB RAM with Micro SD Slot up to 64GB GSM Quad Band 4G HSPA+ (850/1900/2100): US Compatibiliy: AT&T, T-Mobile, Cricket, MetroPCS, and others, including most 3G UMTS/HSPA+ Networks when roaming outside the US Includes Headphones, Screen Protector, Protective case, and USB OTG Cable to work as a Portable Power Bank and Charge Other Devices on the Go 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. 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. 8 GB Storage Capacity (Estimated Free Space 6 GB)