Nokia Lumia 630 RM-978 4.5 InchFactory Unlocked - International Version No Warranty (Black) 2G: GSM 850 / 900 / 1800 / 1900, 3G: HSDPA 900 / 2100 4.5-inch IPS LCD Multi-Touchscreen W/ ClearBlack display and 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 ? 1944 pixels) + Video 720p@30fps Internal Memory: 8GB, 512 MB RAM + microSD Slot Expandable up to 128GB Unlocked cell phones are compatible with GSM carriers like AT&T and T-Mobile as well as with GSM SIM cards (e.g. H20, Straight Talk, and select prepaid carriers). Unlocked cell phones will not work with CDMA Carriers like Sprint, Verizon, Boost or Virgin.