In the default setting, the keyboard can be locked for outgoing calls except for calls to the numbers defined as emergency numbers by pressing  for three seconds; it is unlocked by pressing the star key again for three seconds. Setting a PIN for locking and unlocking the keyboard is optional. On the web interface, the ability to lock the keyboard can be turned off. You can also define a time period of inactivity after which the keyboard will be locked automatically.

On the phone

1. Press and select Maintenance.
   
   
2. Select Security.
   
   
3. Select Change keyboard lock PIN.
   
   
   
   
4. Enter the PIN and confirm by pressing .
   
   Valid values are the digits 0–9.