Secret Codes for Testing Mobile Screens

Many mobile manufacturers provide secret codes, also known as USSD codes, to help users and technicians test hardware components like screens, sensors, and more. Below are some common secret codes for different phone brands.

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LCD Screen Test

LCD Touch Test

Keyboard Test

LCD Gradient Test

LCD Brightness Test

Screen Size Test

1. Samsung

Display Test: *#0*#
Hardware Information: *#7353#

2. Google Pixel

Display Test: No universal code. Use third-party apps or Developer Options for diagnostics.

3. Huawei

Hardware Test: *#*#2846579#*#*

4. LG

General Test Mode: 3845#*model# (replace "model" with your phone's model number, e.g., for LG G6: 3845#*860#)

5. Sony Xperia

Service Menu: *#*#7378423#*#*

6. OnePlus

Diagnostic Mode: *#808# or *#888#

7. Xiaomi

Hardware Test: *#*#6484#*#* or *#*#4636#*#*

8. Motorola

Device Information and Test Mode: *#*#4636#*#*

9. HTC

Test Mode: *#*#3424#*#*

10. Apple iPhone

Apple does not provide open secret codes like Android devices. Use third-party diagnostic apps or visit an Apple Service Center for official diagnostics.

How to Use These Codes

To use these codes, open your phone's dialer app and enter the code as if making a call. If the code is supported by your device, the diagnostic menu will appear.