I am looking for a good car mount that will charge my phone plus automatically switch to the "car mode" when docked. I would like one that goes in the vent or on the dash, I'm not wanting to mount one on my windshield. I would like to find one that I can connect the cable to my AUX and use my phone through the speakers. Is this possible or do I have to purchase a bluetooth device? Please someone give me some advice!! Thanks