Check out the GoGroove Flexpod iphone Car Kit. it might cost more but i think you will be more please with its functions and capabilities.
It does NOT. This is from personal experience today. The car kit doesn't charge the phone, doesn't work as a speakerphone (bluetooth doesn't discover it), and it won't play audio out through the audio jack. As far as the kit is concerned, the iPhone 4 doesn't even exist.
I was able to put velcro on the car kit and get it to charge and connect to BT, but all is not well.
When I try to make selections it acts as if I'm touching a different part of the screen. I was trying to navigate through settings and it brought up email. Once I remove the phone from the dock it's fine. I put it in a dock connected to my computer and don't have any screen issues, just in the tomtom dock. I also have a 3G model and no issues with it in the dock.
I bought a tomtom car kit on Saturday for my iPhone 4 . Initially it wouldn't work, but when I saw that the phone wasn't wide enough to depress the 'button' behind the dock connector I put a piece of card behind the phone and it connected and charged fine and has worked ok all weekend. The speaker is not very loud IMHO, but then I've got a noisy old car