Device Info is a free Android app developed by Wizz.cc, available in the Utilities & Tools category. The app provides a comprehensive list of device information such as Serial Number, Android ID, Google Services key (GSF), and more. It is a lightweight app that does not contain any ads.

The app displays the Android Device ID, which is a unique 64-bit number generated when the device is first set up and remains constant for the lifetime of the device. This ID is used by various services and apps to identify the device. The app also shows the GSF key, which is a specific alphanumeric code associated with the device used to identify it for market downloads on the Play Store. It may also be required by customer support to assist with certain issues.