This app allows you to find all secret codes that are hidden in your device. In Android every application can have a secret code. This app will scan all your installed apps in search of those codes and will give you an opportunity to execute every code you want. There are two groups of codes:
The first group called "Secret Codes" consist of all hidden codes available in your device. This app will show you all of them, but probably not every code will work because your device may have many codes that just do nothing or are not active anymore. Some of secret codes may not be executed directly in this app because of privileges. Those codes will be colored in blue and they need to be entered in your Dialer app.
The second group called "Dialer Codes" consist of known codes that may work on your Samsung or HTC device. This kind of codes must be entered directly in your Dialer.