In previous versions of Android, it was necessary to download an application to make a screenshot of the mobile screen.
In the model that comes with the Sony Xperia SP version, this functionality is already built into the system.
To make the screenshot, simply simultaneously press the power key and the volume down key:
and you're done!
To see the image, simply deploy the notification area, sliding your finger from the top down. In the notification area, the message "Screenshot captured" should appear. Clicking on the message, you can open the image in the "Album" application, and from there we can ship it using any of the applications you have installed: Facebook, Twitter, MMS, Gmail, ...)