User-defined TouchStrips, conveniently placed on the back of the display can also be used for such functions as zoom, scroll, brush size adjustment and canvas rotation.
On its back, two strips of soft-touch plastic break the back into segments: a removable bit up top that houses the 3.5mm headphone jack, a micro-SIM, a vacant microSD slot (the phone comes with 16GB of internal storage) and a fixed piece at the bottom, above which you'll find the Xperia logo.