* Porsche get this whole car phone thing right … they let the car itself (external antennae) do the communications … and you simply pop in your own SIM card … so its safe and simple and there is no radiation within the vehicle.

* BMW completely screw it up. (a) the BMW in-car kits do not switch off the phones internal antennae … although they do limit the radiation by using the external antennae to boost the signal strength … but you still get radiated inside your car. I’m actually quite sensitive to this … I have a z4 coupe … and I have to leave the phone completely switched off inside the car or I feel the radiation in my head (well, pain in my earlobes, to be precise).

(b) using Bluetooth inside your car is just more radiation (albeit low strength) and more gimmicks that can go wrong. Your phone is already plugged into the in-car kitty thing … so there is no need for wireless syncing … it’s all already there. Oh – and the BMW car kits are hopeless. I’m using mine with one of the tiny number of supported phones ( a Sony Ericsson K800i), and it barely works … the phone has to be switched on BEFORE the car is switched on … ridiculous … if you switch the phone on once you are in the car and driving … you have to pull to the side of the road, switch off the engine, turn on phone, turn on car, wait for Bluetooth to init, and then it works. Hardly convenient.