Lock touchscreen & keys
Settings > Security settings
Find it:
>
> Auto keypad lock > None, 5 sec, 30 sec, 1 min,
or 5 min
You can lock your phone's touchscreen and keys
to prevent unwanted phone operations.
Your phone automatically locks the touchscreen
and keys when no activity is detected for
a specified interval.
To
unlock
the touchscreen and keys, press
Power/Lock
and follow the screen instructions.
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Security