I've had a Cayenne TT 2008 on order for ages (UK) and am still awaiting it. I'm really looking forward to it. I have opted for the car phone without handset and will use it in conjunction with the www.orange.co.uk/singlenumber service, leaving the spare SIM in the car. I realise that to add new entries, I need to remove the SIM and edit it in a mobile phone (ensuring that entries are stored on the SIM). I was wondering whether the car phone supported call waiting. I have considered the Nokia CK-15W Bluetooth car kit but wonder if that would look messier than the integrated solution from Porsche. Also I wouldn't be able to use the car's numeric keypad on the dash to dial numbers.

Does anyone know if the integrated solution supports call waiting and has anyone got any opinions on it vs the Nokia solution?