AUTO UNLOCK SCREEN

[HelderTC]

Hello, recently I've bought a xperia SP and I have the next issue, when I'm using my hands free and I receive a call the screen gets unlocked so, the phone is inside my pocket and any key is pressed, it is annoying because sometimes it dials random numbers or enters some apps. Any idea how to avoid that?
Thanks in advance

p.d. Sorry if it is bad translated 

[Uliwooly · Accepted solution]

You can add a lock screen (swipe or pattern)