Just a quick question regarding the iphone cradle for the GSM phone prep. What is the actual point of this and what will I gain with one. I have searched and the only thing I can see is that my phone will get charged when its in the car. A few posts mention the phonebook being displayed in full on the display. Just connecting with bluetooth gives me that, so is there something i am missing or would I be paying £90 just to charge the phone?