When you enter this code, you will see a grid of grey buttons. Here is what they do:
While most codes are harmless read-only tests, some can factory reset or wipe your device. How to Use Secret Codes on SAMSUNG Galaxy A15
If you are buying a used Galaxy A15, this code is your best friend. It brings up the menu. When you enter this code, you will see
Run *#0228# . If the temperature exceeds 40°C (104°F) while idle, or voltage drops from 4.2V to 3.4V rapidly, replace your battery. When you enter this code
code is the most critical for A15 owners. It opens a comprehensive test menu where you can verify the LCD display (checking for dead pixels), touch sensitivity , and both front and back cameras Verification & Identity displays the IMEI and Serial Number