Once, I sort of made it work this way, the thing is that PhoCo would get the call (data transfer) and when you pick up it would at least take 5 secs (to switch to voice transfer (while the person calling would be " Hello.?.Hello.?.hello...) and after that it was taking 20 , 30 seconds to switch back to data transfer.
And I don't even mention a whole bunch of different issues that were making it kind of not practical to use in a car (tweakin your PC while driving because the phone is acting up is not the safest way to go somewhere nor to call someone...)
The only promising thing I came across using the Razr is after installing the Widcomm drivers and without using any software was,
when the BT was conected, I would call my phone and the Audio gateway would pop up a bubble saying "call from XXX XXX XXXX... pick up?" and if you click the yes bubble it would work just fine, no waiting whatsoever.
This was the most effective I have used my Razr with my PC. The big problem being: How do you integrate and skin a windows bubble into RR ?!?!?!