Reviving an old thread. Man, I wish there was a more reliable way to get the connection working using the USB cable to an iPhone. The audio quality is distinctly better that way than via Bluetooth. In a number of audible ways.
It seems like every time I connect a phone to the cable, it fires up the Land Rover app on the phone automatically, and the console screen usually says Bluetooth was disconnected, but then it asks you to connect the USB. I did that! So there's a bit of juggling, swapping USB ports, trying it playing something on Apple Music, swapping ports again, and eventually the LR4 figures out something really IS attached and it starts working. Then I can switch to my Spotify library.
I wish I knew what the secret recipe was to get the vehicle to recognize that the phone really is plugged in already.