Asus Zenfone 2 ZE551ML (4GB RAM, 128GB, 2.3GHz) Operating System: Android v5.0 (Lollipop); Custom UI: Zen UI; SIM Slot(s): Dual SIM, GSM+GSM; SIM Size: SIM1: Micro; Network: 4G: Available (supports Indian bands), 3G: Available, 2G: Available; Dimensions: 152.5 (H) x 77.2 (W) x 10.9 ...