Secret codes, also known as dialer codes or USSD codes, are a series of numbers and symbols that can be entered into the dialer app on your smartphone to access hidden features, test device hardware, and configure settings. These codes are not well-known and are not typically documented in user manuals or online resources. However, they can be incredibly useful for troubleshooting issues, optimizing device performance, and unlocking advanced features.
These codes allow you to check hardware, software, and diagnostic information directly:
| Code | Function | |------|-----------| | *#06# | Show IMEI numbers (for device identification). | | *#888# | Show PCB / hardware version info (sometimes works on Oppo). | | *#1234# | Show software/firmware version. | | *#6776# | Full device information (model, build date, Android version). | | *#*#4636#*#* | Phone info, battery stats, usage statistics (Android standard). | | *#*#3646633#*#* | Engineer Mode (hardware testing for sensors, touch, display). | | *#*#6484#*#* | Hardware test (vibration, speaker, buttons, camera). | | *#*#232338#*#* | Show Wi-Fi MAC address. | | *#*#2664#*#* | Touch screen test. | | *#*#3264#*#* | RAM version info. | | *#*#225#*#* | Calendar & storage info (Google Calendar events). | | *#*#426#*#* | Google Play Services diagnostic (check GMS connection). |
The IMEI code ( *#06# ) is universally the most reliable and works on every Oppo phone, regardless of software version. It is also accessible through Settings > About Phone, but the dialer code is much faster. how to use secret codes on oppo a9 2020 upd
: Used on some updated models as a shortcut to bypass setup screens (use with caution). Important Usage Tips
Secret codes remain a valuable tool for diagnosing and understanding your Oppo A9 2020, even after major software updates. While Oppo has restricted many classic codes for security reasons, the essential diagnostic menus are still accessible through modern alternatives like *#899# and *#800# . The key is knowing which codes to use and understanding that the hidden menu landscape evolves with each ColorOS release.
is its massive , which is designed for longevity and utility. Secret codes, also known as dialer codes or
These codes allow you to access hidden diagnostic menus and critical device information:
: Some codes found online can trigger a factory reset (e.g., *#8778# ) and erase all your data immediately.
For most codes, the phone will automatically display the hidden menu as soon as the last character is typed. If it doesn’t work automatically, press the . Top Hidden Codes for Oppo A9 2020 (2026 Update) These codes allow you to check hardware, software,
: Some codes, particularly those related to "Factory Reset" (like *#8778# ), may erase your data immediately without a confirmation prompt.
A powerful tool to log bugs related to GPS, lag, or network connectivity, allowing you to send detailed reports to Oppo.
Engineering, diagnostic, and testing menus.
These codes are generally used for checking hardware status and viewing information.
Some hidden menus remain active in the background after being opened. Restarting your phone will close them and return all systems to normal.