Earlier versions of Android required a helper application to be downloaded and installed, in order to be able to capture a screenshot of the phone screen.
In the version that comes with the Xperia SP model from Sony, this functionality is already built-in to the system.
To capture the screen, just press simultaneously the Power button and the Volume down button, and keep them pressed for a second:
and that’s all!
In the notification area, the message “Screenshot captured” should appear. Open the notification area, and touch on the message to open the image in the “Album” app. From there, we can send the image using one of the installed applications: Facebook, Twitter, MMS, Gmail,…)