This is a very simple and quick tip for iOS devices. You may wish, or need to, have a record of what is on the screen of your iPhone or iPad, the quickest way of doing this is using iOS’s built in method of taking a Screenshot.
1. Press and hold the Sleep/Wake button.
2. Press and release the Home button.
3. Your will hear the shutter sound.
4. You can then release the Sleep/Wake button.
5. The image will be stored in your Camera Roll.