Nokia CK-7W Guide De L'utilisateur page 23

Switching from handsfree mode to the mobile phone
• If you have connected a compatible mobile phone to the Advanced
Car Kit using the data cable, take the phone out of the holder to
switch operation from the car kit's handsfree mode over to the
mobile phone.
• To change back to the car kit's handsfree mode, replace the mobile
phone in the holder. The mobile phone is now used in handsfree
mode via the Advanced Car Kit.
• If you have connected a compatible mobile phone to the Advanced
Car Kit using Bluetooth technology, you can switch the active call
between the Advanced Car Kit and the mobile phone or vice versa.
Press and hold the button or use the corresponding function in your
mobile phone.
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Operation