Adding a bug: I've many (hundreds likely) contacts on my iPhone 5 (iOS 7.0x) as I use it for work.
When trying to add contacts to the favorites contacts, as well as when trying to call someone, the list only goes to the letter M. No matter if I pick sort order by first,last or last,first, I can scroll down to M, after that, the letters are not bright as if empty and there is no way to get there.
That's a real pain as I do not see a way top create contacts in the car itself. One can edit details but not create a contact it seems. (I've yet to read the manual, I only poked around in every menu I could find).
So there might be a number of contacts limit the car can access through Bluetooth, or an incompatibility with iPhones. I'd need to try with an android device.