In the default Google AOSP Android, there is support for "secret dial codes". This is implemented in the Phone and Contacts applications where they look for numbers of the form " # # # # ". This program provides a simple user interface to list and activate this hidden functionality.
This download is totally safe. Craig Newell is the creator of Hidden Menus which is listed among the Tools category. The developer rolled out a new version of the app on Oct 9, 2011 and over 100K users downloaded and installed this application.
The overall user rating of Hidden Menus is 3.7. This application is often downloaded by Samsung and LG users. Get the installer of Hidden Menus 1.0.2 free of charge and take a look at users' reviews on Droid Informer. The app works flawlessly on Android 2.2 and higher.