Newbie question???

BD1

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On some pics & vids for docking phone in car, What is the round plug on top of the phone used for, That they are plugging in?

Thanks Bill
 

Guurzak

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That's the audio (aux) port. It's intended for headphones, but many newer cars have an aux-in jack so that you can feed audio from a portable device to your car's sound system.
 

grangel

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Convenient

What's nice about it is if you do have a sound system with the AUX-in you can listen to your music or you can use your car speakers as the speakerphone. I asked my wife how I sound and she says it sounds good. The iPhone doesn't do that.
 
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