How to take screenshots directly on the iPhones

If you want to take a screen-shot directly from your iPhone/iPod touch/iPad, and find it directly in your photo library, there is a simple procedure:

1. Press the Home button, without releasing it;
2. Press and release the Sleep button;
3. Release the Home button.

That's all! Now go in your camera roll, and enjoy the image of screen. Some more thing on screen-shots here!
The (so called) Home and Sleep buttons are marked in red in the picture.