I have a 1997 540i BMW. The car came with a phone (a 1997 phone!) which of course doesn't work now as it is obsolete (I think!). Any suggestions as to what to do with that? I have heard about some retrofits (so that I could take advantage of the very neat capabilities the car already has regarding the integration of the phone system with the steering wheel and stereo system), or if I should just replace the center console (as right now it is just dead space), or both (new center console arm rest accessory and retrofit)... Anyone can provide me with the part numbers and links for me to see how to go about this? Are these tweaks easy to do or are they complicated and something can go wrong, in which case it would probably be best to leave things as they are?