Asus Zenfone 2 Unlocked Smart Phone, 5.5 Silver, 64GB Storage 4GB RAM, US Warranty Technology: 4G LTE Built-in Storage: 64GB Operating System: Android 5.0 Lollipop Part Number: ZE551ML-23-4G64GN-SR Data transfer: GPRS, EDGE, HSDPA, LTE, Wi-Fi Form Factor: Smart Phones Dual SIM: Yes SIM Card Type: Micro SIM |