See also:

Contacts
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Switching the interior lamps on and off
Press the button. To switch off permanently: press the button for approx. 3 seconds. Switch back on: press button. ...

Swapping the telephone and additional telephone
The function of the telephone and additional telephone can be swapped automatically. 1. "Telephone". 2. "Bluetooth® (phone)". 3. "Swap phone/addit. phone" ...