ASUS Zenfone 2 Unlocked Smart phone, 5.5 Black, 32GB Storage 4GB RAM, US Warranty Technology: 4G LTE Built-in Storage: 32GB Operating System: Android 5.0 Lollipop Part Number: ZE551ML-6A728WW Mobile Frequencies: 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) Data transfer: DC-HSPA+ (DL/UL): 42/5.76 Mbps; LTE Cat 3 (DL/UL): 100/50 Mbps, Cat4 (DL/UL): 150/50 Mbps Compatible Carrier & Service: Compatible with GSM Networks including AT&T, T-Mobile and cellular network providers utilitzing GSM network such as: Straight Talk, Walmart Family Mobile, MetroPCS, Simple Mobile, Brightspot, Net10, h20 Wireless, and Cricket Wireless Form Factor: Smart Phones |