* Activate 4G at any time on your Xperia XZ (F8331) and benefit of the 4G network of BASE.
* Go to the Start screen.
* Choose *Apps*.
* Choose *Mobile networks*.
* Choose *Preferred network type*.
* Tick *4G (preferred)/WCDMA/GSM*.
* The Xperia XZ (F8331) has now been configured for use of 4G networks.
* Return to the Start screen.