The Android operating system contains a number of useful secret undocumented menus and screens used by techs and service personnel. This collection shows you how to access these menus by simply keying in a number on the keypad.
To access the secret configuration menu, simply type the following code into the phone keypad.
This will launch the secret configuration menu where you can view important information about your device. The screenshots below show the contents of the menus on my phone. To my knowledge this works on rooted and non-rooted phones.
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