All looking for an answer to this please I have what I think is an NTG4 in my E350 CDI 2011 model, It has the stupid memory card holder which is missing but it does have 7 digit Postcode search with DAB and seems to be up to date on the mapping, bluetooth phone works fine but I cant figure out if it can play Audio via Bluetooth, I have the little holder and a cable for an Apple phone (older type) in the centre console with a socket to plug in maybe I should just buy an old IPOD and use that, if I do would it mute etc to answer bluetooth calls?