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 "*#*#[secret code]#*#*".
This program provides a simple user interface to list and activate this hidden functionality.
WARNING: Often these menus are hidden for a reason - they MIGHT damage your phone so be warned.
1.0.2: Fix warning dialog title issue and reported NPE