A free app for Android, by Move More Solutions.

Mobile Hidden Settings Info is an easy-to-use and comprehensive tool that will allow you to browse through all the settings on your Android device, and even look at the contents of the files. 

The best thing about this app is that it is completely free to download, and you will not have to pay a penny for using it. The app is very easy to use, and will not require you to have any prior knowledge of Android systems. You will not need to do anything special to use it, and it will work on most Android devices.