's phone dialer to access hidden menus, diagnostic tools, and system information that isn't typically visible in the standard settings app How to Enter Secret Codes To use any of these codes, simply: (dialer) app. Type the code using the on-screen keypad.
⚠️ – Do not change unknown settings in engineering menus (e.g., radio band selection) unless you know what you’re doing. You could disable cellular functions. How to Use Secret Codes on REDMI 9A
On the Redmi 9A (running MIUI 12 or later based on Android 10 Go edition), these codes interface directly with the and the Engineering Mode (Engineer Mode) – a low-level hardware testing environment. 's phone dialer to access hidden menus, diagnostic
| Code | Function | | :--- | :--- | | *#*#197328640#*#* | On Xiaomi, this may redirect to basic network service menu. Test varies. | | *#*#284#*#* | Generate Bug Report. Creates a huge log file of your phone’s system. Useful for developers but creates a large file in internal storage. | | *#*#34971539#*#* | Camera Firmware Info. Shows details about your camera sensor manufacturer (Samsung, Omnivision, etc.). | You could disable cellular functions
| Code | Function | | :--- | :--- | | *#*#372733#*#* | Enables a graph that shows how smoothly your UI is running (developer tool). | | *#*#32292#*#* | Bluetooth Test. Checks Bluetooth chip functionality. | | *#*#225#*#* | Calendar & Events. Shows upcoming calendar events and related logs (not very useful for most users). | | *#*#426#*#* | Google Play Services. Displays the current status of Google’s push service, ping requests, and connection to GCM (Google Cloud Messaging). |