Here are a few commonly used Android secret codes:
1. IMEI Number: *#06# - This code displays the International Mobile Equipment Identity (IMEI) number of your device.
2. Service Mode: *#0011# - This code allows you to access the service mode on Samsung devices to view detailed network and signal information.
3. Factory Reset: ##7780## or ##273283255663282*## - This code initiates a factory reset but doesn't erase data on all devices.
4. Format Android: 27673855# - This code performs a complete format of the device, including erasing all data.
5. Software and Hardware Information: ##4636## - This code provides information about your phone's software and hardware, including battery and network information.
6. Network Lock Status: *#7465625# - This code checks the network lock status, which may be useful if you have a locked device.
7. Test Mode: ##197328640## - This code opens a test mode menu where you can perform various diagnostics on Samsung devices.
8. Wi-Fi Test Menu: ##232339## or ##526## - Access the Wi-Fi test menu for Android devices.
9. GPS Test Mode: ##1472365## - Enter GPS test mode to check GPS-related information.
10. Quick Test Menu: #0# - This code opens a quick test menu that allows you to check various device features and sensors.