How To Take A Screenshot or Screen Capture With The Sony Ericsson Xperia Arc:
Unfortunately, the Sony Ericsson Xperia Arc cannot natively take screenshots 
However, users can root the device or install the Android SDK to take screenshots. There are many guides out there to achieve this, but be careful!
How To Take A Screenshot or Screen Capture With The Nokia Lumia 1020 To take a screenshot or screen capture with the Nokia Lumia 1020: Hold down the POWER button and the START button at the same time. The POWER button is on the right of the phone, the START button is the middle button on the front of the phone. The images … Continue reading Nokia Lumia 1020...
How To Take A Screenshot or Screen Capture With The Lenovo Vibe X3 To take a screenshot or screen capture with the Lenovo Vibe X3 Press and hold the VOLUME DOWN and POWER buttons at the same time....
How To Take A Screenshot or Screen Capture With The Sony Xperia L To take a screenshot or screen capture with the Sony Xperia L, simply: Hold down the VOLUME DOWN button and the POWER button for a few seconds. ...
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....