You can use the radioplayercar.com device, which gives you dab, music streaming by Bluetooth, and full hands free phone use. It uses your aux in socket, and is hidden.
I've just had one fitted into my 2010 Cali. It's the just the solution I was looking for (wanting to keep the dash as original as possible), but I'm struggling a bit with it. It demands a lot of your phone, and mine seems to have some teething / installation issues, but there is a money back guarantee if you don't like it.