Find "Security code"
Press Settings.
Press Security.
Press Device lock.
Press Security code.
Change phone lock code
Press the field below Current security code and key in the phone lock code.
Press the field below New security code and key in a new phone lock code.
Press the field below Verify new security code and key in the new phone lock code.
Press Save to confirm.
Exit
Slide your finger across the display to return to standby mode.
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