Reference

Xperia Link

You can connect your tablet to internet by using tethering function of Xperia(TM) smartphone*. Tethering settings of smartphone can be controlled from tablet by remote control, so you can connect your tablet to internet with your smartphone in bag or pocket.
* To use this function, you need an Xperia(TM) smartphone with tethering capability and the [Xperia Link] app.