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If the phone lock code is activated, it needs to be keyed in when you turn on the phone. Follow these instructions to change the phone lock code.
Find "Lock code"
Press the Menu key.
Press Phone management.
Press Security settings.
Press Phone and SIM card.
Press Lock code.
Change phone lock code
Key in the current phone lock code (default is 12345) and press OK.
Key in the new phone lock code and press OK.
Key in the new phone lock code again and press OK.
Press the Menu key to return to standby mode.