Its too hard to talk over the phone while driving and that too within the city. While I visited autoshop few days back to get my car audio system checked for a minor fix, I found this wonderful product called Smart Talk designed and developed by iGadgets India.
This device lets me get hooked on to my phone via bluetooth. You can sync the phone book to quickly start making calls. It comes with two microphones, a hear phone for privacy (if required ), FM channel to use car audio system, one touch dial and receive calls, gives an option to record and play the call etc. Call quality and clarity is good. Motorola phones seem to be having problems with phone book sync but Nokia just works. Rear view mirror is an attachment on top of your existing one. Its comes with day and night lens and quite wide to give clear picture.
It costs 5000 rs.. bit heavy on pocket but worth spending the money on such device if you drive a lot within the city.
Find more information on their website https://www.igadgetsindia.com