ASUS ZenFone2 Unlocked Smartphone, 16GB, 4GB RAM, Black - ZE551ML (U.S. Warranty) Unlocked GSM, Dual SIM smartphone with 4G/LTE, and 802.11ac connectivity 64-bit Intel 1.8GHz Quad Core process with 4GB RAM and 16G storage 5.5-inch IPS full HD display (Gorilla Glass 3); 13MP rear and 5MP front camera. GSM/EDGE (850, 900, 1800, 1900 MHz), UMTS/HSPA+/DC-HSDPA (850, 900, 1700/2100, 1900, 2100 MHz), LTE (Bands 1, 2, 3, 4, 5, 7, 8, 17, 20). Compatible with GSM Networks including AT&T, T-Mobile and cellular network providers utilizing GSM network such as: Straight Talk, Walmart Family Mobile, MetroPCS, Simple Mobile, Bright spot, Net10, h20 Wireless, and Cricket Wireless.