"Please note that you may void the warranty of your phone if you unlock the boot loader" says the warning on Sony Ericsson 'Unlockbootloader' developer site as it provides details on just how to unlock the Android bootloader.According to the
Reg, "The unlock applies only to 2011 phones running Android 2.3 Gingerbread, and to handsets that haven't been tied to a network operator..."
Sony E says, "Certain content on your phone may also be inaccessible due to the removal of DRM security keys and the secure user data partition while unlocking the boot loader."
There you go... developer fun.