Sony Ericsson P900 - Screen Lock

Getting to know your P900 37
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Automatic key lock
This option locks the keys on your P900. This is to protect the
device if the keys are accidentally pressed. When this setting is
active, the Flip closed keypad will become automatically locked
after a period of inactivity.
To activate or change the key lock
Select
Control panel > Device > Locks.
To unlock the keys
Select
> .
Screen lock
This option locks the screen of your P900. 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 .