Nokia A00022768 8GB Black Unlocked Cell Phone 3G 5 Built-in Storage: 8GB Operating System: Windows Phone OS 8.1 with Lumia Denim update Mobile Frequencies: WCDMA (UMTS) / GSM 850/900/1800/1900 Form Factor: Touch Screen Phones Main Display Size: 5 Rear Camera: 5.0 MP Talk Time: Up to 780 minutes Standby Time: Up to 552 hours