Nokia Lumia 635 'Cortana' 8GB Unlocked GSM 4G LTE Windows 8.1 Quad-Core Phone - White 2G: GSM 850 / 900 / 1800 / 1900, 3G: HSDPA 850 / 1700 / 1900 / 2100, 4G: LTE 700 / 850 / 1700 / 1900 / 2100 / 2600 (Bands: 2, 4, 5, 7, 17) 4.5 - inch IPS LCD Capacitive Multi-Touchscreen w/ Protective Corning Gorilla Glass 3 Microsoft Windows Phone 8.1, Quad-Core 1.2 GHz Cortex-A7 Processor, Chipset: Qualcomm Snapdragon 4, Adreno 305 Graphics 5 Megapixel Camera (2592 x 1944 pixels) w/ Autofocus Internal Memory: 8GB, 512 MB RAM + microSD Slot Expandable up to 128GB