2. Find a USB cable and connect it to the mobile phone.

3. Wash your hands or get your hands wet.

4. When the hand is wet, the thumb of the same hand touches the metal part at the other end of the USB cable, and the index finger presses on the ground for about two seconds.

5. When the back cover is removed, we can see that there is a small metal block next to the battery compartment, which is the mobile phone vibration generator, commonly known as vibrator. Because it is also directly connected to the main board of the mobile phone, we can do the same. When the hand is wet, the thumb of the same hand touches the vibrator and the index finger presses to the ground for about two seconds.