Hi, I recently got a new phone (Xperia Z5) so I decided to turn my old phone (HTC Butterfly S) into car stereo head unit, so I wondering how can I transfer a call or access contact list from my Z5 with my HTC via Bluetooth or WiFi? Right now I'm using my Garmin GPS unit which paired with my Z5 via Bluetooth, I can answer a call and access my contact list from there, but because it's a stand-alone gps unit the call go through small speaker on the back of the unit and the microphone is not very good, so it would be nicer to do it through the HTC which connected to car speaker. If anyone knows apps or ways to connect my Z5 to HTC please let me know, thank you.