
Vodafone 155
Find "Security"
Press the Navigation key.
Scroll to Settings and press the Navigation key.
Scroll to Security and press the Navigation key.
Change phone lock code
Scroll to Change phone code and press the Navigation key.
Key in the current phone lock code and press the Navigation key.
Key in a new phone lock code and press the Navigation key.
Key in the new phone lock code again and press the Navigation key.
Exit
Press Disconnect the necessary number of times to return to standby mode.