Nokia Lumia 1520 16GB Unlocked GSM 4G LTE Windows Smartphone w/ 20MP Camera & PureView Technology - Yellow (No Warranty) Windows 8 operating system CPU name: Qualcomm&reg; Snapdragon&trade; 800 GSM network: 850 MHz, 900 MHz, 1800 MHz, 1900 MHz Main camera: 20.0&nbsp;MP