BLU Studio 6.0 Unlocked Cellphone, Black Qualcomm Snapdragon 400 1.6 GHz Quad core with Andreno 305 GPU 13MP Main Camera with LED Flash and 5MP Front camera. 16GB Internal Memory, 2GB RAM. Micro SD Slot up to 64GB 4G HSPA+ up to 42 Mbps Nationwide including AT&T, T-Mobile, MetroPCS, Cricket Wireless, Straight Talk, Net10, Ultra Mobile, Walmart Family Mobile, H20 Wireless, 420 Wireless, Red Pocket, Telcel America, Lyca, Go Smart and more.. 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.