The keypad lock prevents any accidental use of the telephone. if the device is locked with a PIN, you need this to unlock,
Switch on: Key "# aA" Press and hold
Switch off: Press and hold Key "# aA" ... use to enter the handset PIN (Default 1234)
If a call is indicated on the handset, the keypad automatically unlocks and you can accept the call.
Changing the PIN.
The device is protected against unauthorised use by a PIN is enabled. Change the device PIN by opening the web-interface.
Click on the Icon in the right upper screen and select Change Phone PIN.