I've read some of the threads in the section about updating the audio system in a w123 but I've no ability or desire to attempt any electrical DIY projects.

I'd like the ability to play audio from my mobile phone by aux input or Bluetooth.

Is this something that a commercial establishment could undertake? What would one need to have done to have this functionality and have it sound good too?

I'm sure this post demonstrates my ignorance on the subject but it is what it is.