Screen locks itself after call I have a Samsung Galaxy SII GT-9100 with Android Jelly Bean 4.1.2 XXLS8. I am using a PIN for my screen lock. If I make a call while my phone is unlocked, when the call is ended the screen goes to the lock. It is really annoying. How can I fix this?
Try disconnecting the call before the other side hangs up. 

I've noticed a similar behavior in ICS 4.0, where if I disconnect the call first the phone does not lock.