bluetooth

I have a bmw z3 from 1999 and want to put the original radio back in because the Sony one I have now looks like it’s from a spaceship - I wanted an original look and I saw that the blaupunkt radios don’t sit flush with the rest of the plastic - I would like to install Bluetooth into the original...

Some owners have put in a Dab head unit or are thinking about it, just wondered what the advantages of Dab are over streaming Internet radio from your mobile phone?