Using Android speakerphone's microphone

Hi all,

In my Unity Android app, the user is looking at the phone (as if gaming) while talking. However, the recorded sound (using Microphone.Start) is too low.

Therefore, I want to use the microphone boost of the Android's "speakerphone" option (shown while in a call). Is this possible right from Unity? or do I have to build an Eclipse project (as described here) to invoke setSpeakerphoneOn(true) (which I suppose will boost both the phone's mic and the loudspeaker, although the latter isn't needed/desirable), before invoking my Unity app?

Best regards,
Peter

EDIT: sorry for misplacing this thread. How can I move it to the android development forum?