I have the F20BT, which I understand is the Australian version of the Z120BT. I also have two iPhones, one 3G and one 3GS, both of which seem to work perfectly once synced, the issue I have is that about the switching.
If I preference my phone it works fine, if I preference my wifes phone it works fine. The problem is that if my phone is preferenced the system will NOT hook up to her phone, even if I'm in another state (and vice versa). Seems I have to manually change which phone will be connecting.
To be 100% clear, there is only one phone in or near the car at any one time, so i