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Next, Maya entered #0 # out of curiosity. The phone jumped to a diagnostic menu with tiles for testing the screen, camera, sensors, and touch input. She tapped each one: the red, green, blue screen tests confirmed there was no dead pixel; the touch test showed smooth response across the display. Satisfied, she exited by pressing Back.
. These codes, often called USSD or MMI codes, trigger hidden diagnostic menus and system information screens. How to Enter Secret Codes
: Opens a menu where you can delete log files (dumpstate/logcat) to free up system memory. *#7353#
