You may be familiar with Android phones' Hidden Menu. The Google team left it as a surprise for consumers to find. The app package, which opens settings, also enables you to access the Hidden Menu. The Hidden Menu will enable you to perform the following tasks: To check for black spots, change your display to green, black, blue, or red. A touch sensitivity test Test the responsiveness of your keyboard. Check the volume of your speakers. How to access the hidden menu is as follows: Start the app on your phone. Dial *#0*# Await the appearance of the menu screen. While you're at it, input the following code: *#*#4636#*#*. You would discover more about your smartphone than what is provided in the About Phones or App Info segments.