Sony Xleria P Boot Loader Unlocked Vs Locked

Unlocked	Locked
Can flash customer kernels and/or Roms	Cannot install Custom kernels
May void the warranty of your phone	Can gain the root access without unlocking
DRM security keys will be lost Simply digital rights management (DRM) key are used to manage the copyrights of media files	Can install the Custom Roms
Will not give you root access just by unlocking	Can install CWM Recovery
Certain functions in your phone might cease to work (DRM related,…)
Might also damage your phone permanently. In the worst case (by Overheating with over clocking)
Everything that can do with a locked boot loader J (of course without DRM)

** Sony itself allowed and supporting to unlock some of Xperia NXT series phone (released after 2011) **

To check if your phone can be unlocked, follow the steps below:

1. First, open the dialler and enter *#*#7378423#*#* to access the service menu.
2. Tap Service info > Configuration > Rooting Status. If Boot loader unlocks allowed says Yes, then you can continue with the next step. If it says No, or if the status is missing, your device cannot be unlocked.

For More info: http://unlockbootloader.sonymobile.com/