How to Take a Screenshot on a Windows Phone
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Press Power + Volume Up button simultaneously, the captured screen will be stored in Screenshots Album which you can find in Photos Hub. (This combination of keys to take a screenshot on a Windows Phone will work only on Windows Phone 8.1 version).
If you have Windows Phone 8 you can try out the below key combinations to take a screenshot on a Windows Phone.
Press and hold Start + Power simultaneously to take the screenshot of the screen.