For the Samsung Galaxy A7 (2018 model specifically), *#0*# is the most useful — it lets you test the screen, vibration, and sensors without rooting.
Used to manage system logs. A popular use is clicking "Delete dumpstate/logcat" to clear junk files and potentially improve performance.
These codes are specific to Samsung's One UI and provide deep access to hardware and firmware details: Secret Code Hardware Test Menu Check IMEI Number Battery Status & Health Firmware Version Info System Dump (Speed Boost) USB Configuration Advanced WiFi Info The "General Test Mode" (Master Code:
