*#899# - Opens the main diagnostic menu for manual hardware tests.
To enter secret codes on Oppo A9 2020, follow these steps:
Secret codes, also known as dialer codes or engineering codes, are special sequences of numbers and symbols that can be entered into the phone's dialer to access hidden features and menus. These codes are usually not documented in the user manual or online resources, but they can be useful for advanced users, developers, and technicians. how to use secret codes on oppo a9 2020 upd
: Opens the factory test menu to check hardware like the screen, touch, and audio. *#6776#
Displays real-time battery statistics: voltage (mV), temperature (°C), and state of health. Note that OPPO doesn't show cycle count here, but you can see if the battery overheats. *#899# - Opens the main diagnostic menu for
: Displays the specific absorption rate (radiation level) for your device. Advanced Testing & Feedback
Secret codes (often called USSD codes or MMI codes) are special sequences of characters that you type into your phone’s dialer to access hidden menus, diagnostic tools, and testing modes. : Opens the factory test menu to check
Using secret codes on your Oppo A9 2020 can unlock new features and provide you with valuable information about your device. However, be cautious when using these codes, and always use them at your own risk. With this guide, you're now ready to explore the world of secret codes on your Oppo A9 2020. Happy experimenting!
If the default phone app is not triggering codes, try using Google Dialer or another dialer app from the Play Store—though this rarely resolves code restrictions imposed at the system level.