See your device’s warranty statement for details.
If you unlock the bootloader, you may void the warranty of your device and/or any warranty from your operator. If you are not familiar with the risks involved, you should not proceed further. We are proud to deliver great software experiences through our rigorously tested and official software releases. However, we recommend standard users not to unlock the bootloader, as it is not needed.
By unlocking the bootloader, it’s possible to put custom ROMs on your Xperia™ device.