For entertainment purposes only!!
Intuitively use the device's accelerometer controls to start, rev up, and idle your own imaginary truck. It's so easy to use, even adults can be in on the fun of driving your own truck around.
Give your device a key twist to start up your imaginary truck when you first open the app, then rev it by holding the device just like a real handle and twisting it towards the floor.
While holding your device horizontally like a truck handle, twist from the direction of less engine sounds to more throttle by twisting it slowly rather than quickly as done above for a rev sound. When you rev your imaginary truck, you'll smile for joy as you feel the vibrations from your device truck shaking in your hand. With a bit more imagination, you'll feel the sun on your back and the endless road passing by.
Make sure that the ringer is not set to vibrate only.