The '02 3.0d Sport I've just bought has nav, dsp, and a small Motorola flip-phone plugged in under the upper armrest cover. It appears to be an OEM install — the phone pops up at the press of a button and is wired in with a coiled cable.

It works if I pop my sim in, but obviously that's a bit of a pain every time.

So, what are my options? I've searched for a few days and can only find retrofits for cars with nothing installed — I'm guessing mine must already have a mic, speaker (possibly) and maybe an antenna? Will this be of any use with a BMW Bluetooth retrofit, or will I need to replace it all.