Nokia Lumia 830 16GB Unlocked GSM 4G LTE Windows 8.1 Smartphone w/ 10MP Camera - Green (Certified Refurbished) 2G: GSM 850 / 900 / 1800 / 1900, 3G: HSDPA 850 / 900 / 1900 / 2100, 4G: LTE 700 / 850 / 1700 (AWS) / 1900 / 2100 (Bands 2, 4, 5, 7, 17) 5.0-inch IPS LCD Multi-Touchscreen w/ Protective Corning Gorilla Glass 3 and ClearGreen display Microsoft Windows Phone 8.1, Quad-Core 1.2 GHz Cortex-A7 Processor, Chipset: Qualcomm Snapdragon 4, Adreno 305 Graphics 10 Megapixel Camera (3520 x 2640 pixels) w/ Carl Zeiss Optics & Optical Image Stabilization + Front-Facing Camera Internal Memory: 16GB, 1GB RAM + microSD Slot Expandable up to 128GB