I have a DICE Electronics G2 cradle in my car, attached to a Kuda Mounting surface. iPhone 4 works fine if I use the 2g iPhone mounting bracket. Fits almost perfectly, actually. It also works with the 3G/s bracket, but it's a bit tighter. The G2 cradle works great with the iPhone 4, as well, however this isn't really integrated into the car stereo...it just plays through the AUX in.