Android All Function Check Codes: A Complete Guide

Android devices come with various secret codes that can be used to check system information, perform tests on hardware components, or access hidden settings. These codes are a powerful tool for users who want to get more out of their device, whether they’re troubleshooting, checking device health, or simply exploring hidden features.

In this guide, we’ll walk you through the Android function check codes that allow you to test various components of your Android device, such as the display, battery, sensors, and more. These codes are easy to use, but some of them might be specific to certain manufacturers or Android versions.

Important Note: These codes work on most Android devices but might not work on all, especially with custom ROMs or heavily modified versions of Android. Always proceed with caution and avoid using codes that can reset or wipe your device unless you are fully aware of the consequences.

What Are Android Function Check Codes?

Android function check codes are special dialer codes (also known as USSD codes) that you can enter on your phone’s dialer to perform various system checks. They give you access to diagnostic tools for testing hardware, checking system info, and accessing hidden features or menus.

Most of these codes are meant for developers and technicians, but they can also be useful to regular users for testing the health of their device or solving common issues.

Popular Android Function Check Codes

Here are some commonly used Android function check codes to test various parts of your device:

1. General Information and Testing Codes

  • *#*#4636#*#*: Opens a Testing Menu where you can view information about your device. This includes:

    • Battery info
    • Usage statistics
    • Wi-Fi information
    • Phone information (network type, signal strength, etc.)

  • *#*#0*#*#*: Opens a hardware diagnostic menu that allows you to test various hardware components such as:

    • Display (color test, screen calibration)
    • Camera (front and rear camera test)
    • Sensors (proximity, accelerometer, etc.)
    • Speaker and vibration test

  • *#*#197328640#*#*: Opens Service Mode, which provides detailed network information such as:

    • Signal strength
    • Network registration
    • Mobile data settings

  • *#*#232331#*#*: Displays the Wi-Fi MAC address for your device, useful for networking or troubleshooting connection issues.

2. Battery and Power Testing Codes

  • *#*#0228#*#*: Displays detailed battery status, including battery voltage, level, temperature, and health status.

  • *#*#4636#*#*: In addition to system information, this code allows you to check battery info, including:

    • Battery temperature
    • Charging status
    • Battery health (good, bad, or charging)

3. Display and Screen Testing Codes

  • *#*#0588#*#*: Tests the proximity sensor on your device, which detects when the phone is close to your face during calls.

  • *#*#2664#*#*: Opens a touchscreen test, allowing you to check the responsiveness of the touchscreen across various areas of the screen.

  • *#*#0#*#*: This is a screen test code where you can check your display for dead pixels, color accuracy, and other visual issues.

4. Camera and Sensor Testing Codes

  • *#*#3264#*#*: Displays detailed RAM information, such as the total amount of RAM and the current RAM status.

  • *#*#0283#*#*: Opens a loopback test to check both the microphone and speaker functionality.

  • *#*#232337#*#*: Displays the Bluetooth MAC address, useful if you’re troubleshooting Bluetooth issues.

5. Network and Connectivity Testing Codes

  • *#*#225#*#*: Opens the calendar of your device, showing all events and appointments scheduled on your device.

  • *#*#3282#*#*: Displays your data usage information, showing the amount of data you've used during a specific time period.

  • *#*#4636#*#*: This code provides detailed Wi-Fi information including signal strength, access points, and current connection data.

6. Service Mode and Debugging Codes

  • *#*#197328640#*#*: Opens Service Mode for detailed debugging information. This allows you to test various network, call, and connectivity options.

  • *#*#273282*255*663282*#*#*: Opens a file backup menu, allowing you to back up media files such as photos, videos, and audio.

  • *#*#7780#*#*: Performs a factory reset without deleting internal storage. This resets settings to default values but does not erase apps, photos, or other data stored on your device.

7. Advanced System and Debugging Codes

  • *#*#4636#*#*: Provides detailed information about your device’s system settings, network registration, Wi-Fi stats, and more.

  • *#*#4444#*#*: Displays advanced system settings and allows you to make adjustments to system configurations.

How to Use These Android Function Check Codes

Using Android function check codes is simple:

  1. Open the Phone App: Go to your phone’s dialer as if you were dialing a number.
  2. Enter the Code: Type in the code exactly as shown above (e.g., *#*#4636#*#*).
  3. Access the Menu: Upon entering the code, your device will either automatically open the corresponding menu or show a pop-up window with the options to test or view system information.

Note: Some codes might not work on all Android phones, especially if the device is running a custom ROM or a different manufacturer’s Android version.

Manufacturer-Specific Function Check Codes

Some Android devices, especially those from manufacturers like Samsung, Xiaomi, or Huawei, may have their own set of function check codes. These codes are specifically tailored to test components unique to their hardware.

Samsung Android Devices:

  • *#0*#: Opens the Samsung Diagnostic Menu that tests various components such as the screen, speaker, camera, etc.
  • *#1234#: Displays software version information.
  • *#2663#: Checks the touchscreen version.

Xiaomi Devices:

  • *#*#6484#*#*: Opens Xiaomi's diagnostic mode.
  • *#*#1357946#*#*: Displays hardware testing info.

Huawei Devices:

  • *#*#2846579#*#*: Opens Huawei’s Project Menu, where you can check various phone settings and perform diagnostics.

Important Notes and Warnings

  • Use Caution: Some codes, particularly those related to factory resets and service modes, can cause irreversible changes to your device, such as wiping data or resetting settings. Always make sure to back up your data before proceeding.
  • Device-Specific Codes: Not all Android devices support the same codes. Some codes may not work on certain brands, models, or regions.
  • Custom ROMs and Rooted Devices: If you have a custom ROM or a rooted device, certain codes may behave differently, or they may not work at all.
  • Testing Only: Most of these codes are for testing purposes and should only be used when necessary. Avoid experimenting with codes you don’t understand, as some might alter system settings or perform resets.

Conclusion

Android function check codes provide a quick and easy way to access diagnostic tools, test your phone’s hardware, and gather useful system information. These codes can help you ensure your phone is in good health or identify potential issues before they become problems.

However, always be cautious when using these codes. Some codes can lead to permanent changes to your system, such as factory resets or data loss. Only use the codes you fully understand, and make sure to back up your data regularly.

With the right knowledge, these hidden codes can be a great asset in optimizing your Android experience and troubleshooting problems on your device.