Want to avoid accidentally making a call when your phone is in your pocket or bag?

  1. Press the power key.

Unlock the keys and screen

  1. Press the power key, and drag the lock screen up. With front of phone facing you, lock key is second item on right edge of phone.

Set the keys and screen to lock automatically

  1. On the start screen, swipe left, tap settings iconSettings > lock screen > Screen times out after, and select the length of time after which the keys and screen are locked automatically.