I believe I am correct when I say that using a phone via Bluetooth connectivity has always been an issue with the Karma. I very quickly abandoned trying to speak on the phone over Bluetooth because there was so much crackling.
Here is a thread on the topic:
http://www.fiskerbuzz.com/forums/13-fisker-karma/4585-blutooth-telephone.html
Here is a thread on the topic:
http://www.fiskerbuzz.com/forums/13-fisker-karma/4585-blutooth-telephone.html