How To Take A Screenshot or Screen Capture With The BlackBerry Curve
Unfortunately, there is no way to natively take a screenshot on a BlackBerry Curve 
However, users can use apps like Capture It or Screen Muncher to take screenshots.
How To Take A Screenshot or Screen Capture With The XOLO One To take a screenshot or screen capture with the XOLO One Press and hold the VOLUME DOWN and POWER buttons at the same time. The VOLUME DOWN button is on the left of the phone and the POWER on the right....
How To Take A Screenshot or Screen Capture With The HTC One M9 To take a screenshot or screen capture with the HTC One M9 Press and hold the VOLUME DOWN and POWER buttons at the same time....
How To Take A Screenshot or Screen Capture With The HTC Desire 826 To take a screenshot or screen capture with the HTC Desire 826: Hold down the POWER button and the VOLUME DOWN button at the same time....
How To Take A Screenshot With Blackberry Z10 / 10 To take a screenshot or screen capture on the Blackberry Z10 or the Blackberry 10, simply: Hold down the VOLUME UP and VOLUME DOWN buttons simultaneously. The image will appear in the SCREENSHOT folder....