Nokia N700

Find "Security code"

Press the Menu key.

Find "Security code"

Press Settings.

Find "Security code"

Press Phone.

Find "Security code"

Press Phone management.

Find "Security code"

Press Security settings.

Find "Security code"

Press Phone and SIM card.

Find "Security code"

Press Security code.

Change phone lock code

If a phone lock code has been created already:
Key in the current phone lock code and press OK.

Change phone lock code

Key in a new phone lock code and press OK.

Change phone lock code

Key in the new phone lock code again and press OK.

Exit

Press the Menu key to return to standby mode.