From the menus, select Settings > Phone settings > Keyguard settings > Automatic
keyguard > On or Off.
If you selected On, at the Set delay prompt, enter the delay (in mm:ss format), and
When the keyguard is on, calls still may be possible to the official emergency number
programmed into your phone. Enter the emergency number, and press the Talk key.
• SELECT SILENT PROFILE
If you do not want the phone to disturb others, you can select the profile in which the
ringing tone and all other tones are silenced.
At the start screen, quickly press and release the Power key.