1. Find "Passcode Lock"
2. Select option
Turn on use of phone lock code, go to 2a.
Turn off use of phone lock code, go to 2b.

3. 2a - Turn on use of phone lock code
Key in a phone lock code of your own choice.
Key in the same phone lock code again.
4. 2b - Turn off use of phone lock code
Key in your phone lock code.
5. Exit
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