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I've searched and found several posts on various sites with this same problem but nobody offering a solution.

I use my N1 in a car mount with music playing through my stereo with a 3.5 mm cable. When I make or receive a call, I have 2 options. I can either hear the other person through the car speakers clearly, but they can't hear me. The other option is to turn on speakerphone and they can hear me clearly but they are piped through the phone's speaker on the back which is tinny and hard to hear in the car.

The obvious solution seems to be to use the headphone jack as the output for the call audio but with the input treated the same as when speakerphone is on, but I can't find a setting or an app to achieve this.

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FWIW, I have the same problem with my Galaxy Nexus. I have to use speakerphone to get the mic to pick up my voice reasonably, but then I don't get the audio in my stereo speakers. It may be an issue that lies in Android itself. –  eldarerathis Aug 5 '12 at 5:52
    
I recently solved this issue with a bluetooth a2dp/hands-free car adapter from belkin (see more on amazon. Have it for 3days working now and am very pleased. (reconnects auto'magic'ally when I enter the car, starts playing at the last known position bz pressing the belkin button. It has some background noise audible during quiet parts (as with most bt a2dp sets, I guess it's the cheap switching pwr supply which I will replace) –  ce4 Aug 5 '12 at 8:52
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1 Answer 1

I wrote an app called SoundAbout. The pro version has a phone call audio setting called "Wired Headphone" and "Wired Headset (with mic)". If you use the "Wired Headphones" setting, it will keep the phone's built in mic while routing phone call audio to the car speaker.

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