"iPhone began to vibrate suddenly. The power supply doesn't enter. Why!?"
When the application program is started, the explanation is written on a jet-black screen only a little.
Please read the explanation, and, first, incline iPhone.
Then, the explanation is hidden and it disappears.
Next, please touch the screen.
It vibrates more intensely when touching again.
In addition, it vibrates more intensely when touching again.
In addition, it stops if touching further again.
This application program can be used as a massage machine.
However, it is likely not to go out of the region of the joke application program because the vibration is a little weak.
End it after it plays.