'Home' button (the big rectangular physical key below the display), and while holding it, click the power/lock key on the right. The screen will flash for a fraction of a second, indicating that it has stored the screenshot. You can then access the picture of your screen in the Gallery app, under the Screenshots folder.Just hold the
It's a simple trick that can be useful in many situations, and it actually works on all recent Samsung Android devices - the Galaxy S4, Galaxy Note 3, and others. While other, non-Samsung devices might not capture screenshots in the same way, you should keep in mind that Samsung has been using it all along - chances are that even on a future Samsung Galaxy S6 you could take a screenshot that way.