I've just bought a Nexus 4 for my wife but it doesn't seem to be compatible with her Merc's Bluetooth handsfree. It connects OK but there is no audio/volume. My N4 works great with my Audi's bluetooth in contrast.
Anyone any ideas how to resolve this or will I have to send it back? I've googled around a bit but not found anything other than complaints about the Bluetooth compatibility. I know 4.3 is meant to resolve this but I don't want to risk waiting for it.