The fastest way to access the diagnostic screen is through the phone's keypad. This "General Test Mode" is used by technicians to verify hardware functionality.
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: This opens a grid. Trace your finger across all squares; if they turn green, your touch sensitivity is working perfectly. Sub Key : Tests the physical buttons on your device. The fastest way to access the diagnostic screen
: These full-screen color tests help you spot dead pixels or backlight bleeding. if they turn green
