Find "Passcode Lock"
Press Settings.
Press General.
Press Passcode Lock.
Select option
Select one of the following options:
Turn on use of phone lock code, go to 2a.
Turn off use of phone lock code, go to 2b.
Turn on use of phone lock code, go to 2a.
Turn off use of phone lock code, go to 2b.
2a - Turn on use of phone lock code
Press Turn Passcode On.
Key in a phone lock code of your own choice.
Key in the same phone lock code again.
Key in a phone lock code of your own choice.
Key in the same phone lock code again.
Press Require Passcode.
Press Immediately or the required interval.
Press Passcode Lock to go back to the settings.
2b - Turn off use of phone lock code
Press Turn Passcode Off.
Key in your phone lock code.
Key in your phone lock code.
Exit
Press the Home key to return to standby mode.
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