Sony Ericsson P908 - Manual (Page 42)

42 Getting to know your P908
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Screen lock
This option locks the screen of your P908. This is to protect the
device if the screen is accidentally pressed in Flip open mode or
with the Flip removed. When this setting is active, the screen
will automatically become locked after a period of inactivity.
To activate or change the screen lock
1. Select > Settings .
2. Select a lock time or Off .
To lock the screen
Select > Lock screen .
To unlock the screen
Push the Jog Dial Forward > Inward or Backward > Inward .