1 Find "Phone autolock period"
Press the Menu key.
Press Settings.
Press Phone.
Press Phone management.
Press Security settings.
Press Phone and SIM card.
Press Phone autolock period.
2 Turn use of phone lock code on or off
To turn on the phone lock code:
Press User defined.
Press User defined.
Key in the required number of minutes.
Press OK.
Press OK.
To turn off the phone lock code:
Press None.
Press None.
Key in the phone lock code and press OK.
3 Exit
Press the Menu key to return to standby mode.