Here’s a helpful, user-friendly content piece on using secret codes on the Oppo A9 2020 (running ColorOS, typically based on Android 9–11).
# or restarting the dialer.*#*#426#*#* – FCM Diagnostics: Provides information on Google Play Services connection events.
Phone Information. Detailed battery stats, Wi-Fi status, and network usage. 📝 Step-by-Step Guide Open Dialer: Tap the Phone app icon on your home screen. Enter Code: Carefully type the sequence (e.g., *#899#).
To use secret codes on your OPPO A9 2020 Go to product viewer dialog for this item.
, you must enter specific numerical strings into the stock Phone (Dialer) app. These codes allow you to access hidden diagnostic menus, check hardware health, and view advanced software information that is not visible in standard settings. How to Use Secret Codes Open the Phone app on your Oppo A9 2020 Navigate to the dial pad. Type the desired code starting with * or #.
Reverse Charging: This feature turns your phone into a portable power bank. By using an OTG (On-The-Go) cable, you can reverse charge other devices like a friend's phone or your wireless earbuds.
Proceed with caution, and never share your IMEI or other sensitive info displayed by these codes.
