Rdtcmtt

Hello folks , so far love my journey. just a dumb question is it possible to upgrade my 4.3/REB to a 8.4. im sure it will be expensive. the only advantage I see is getting navigation. What im really wanting is to add a Bluetooth phone. there is a space on the steering wheel where a button goes for the phone, what will I have to do to get a Bluetooth phone and possibility voice recognition. optimum im wanting nav and phone and voice rec. also back up camera. Thanks.....................Robert