BLU Studio 7.0 Unlocked Cellphone, Blue GSM Unlocked 4G Smartphone 8GB internal storage + 1GB RAM with Micro SD Slot up to 64GB MediaTek Dual Core 1.3 GHz Processor with Mail 400 GPU Android OS, v4.4 (Kit Kat) 5MP Autofocus Main Camera, 2MP Front Camera 4G HSPA+ up to 21Mbps 850/1900 Nationwide AT&T: Cricket Wireless, Straight Talk, Net10, H20 Wireless, 420 Wireless, Black Wireless, Consumer Cellular, Pure Talk USA, Red Pocket, Telcel America. 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, Pure Talk USA and select prepaid carriers). Unlocked cell phones will not work with CDMA Carriers like Sprint, Verizon, Boost or Virgin. Charge the phone with a 2amp charger if the phone run out of charge completely 8 GB Storage Capacity (Estimated Free Space 6 GB) 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)