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Is it possible to just use a headset's mic but keep the phone's ear-speaker active?

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Welcome to Usually the jack tells the phone to direct the sound to it only. Can you specify the device you have (brand and model)? – Zuul Jul 30 '12 at 14:39
Thanks zuul. The phone is a Samsung Galaxy Nexus but i hope there is a OS-dependent solution, rather than phone-specific hacks. – superno Jul 30 '12 at 15:05
You can refer to this recent answer to a similar issue. Basically: If a wired headset is plugged into the phone, it replaces the phone's built-in earpiece. – Zuul Jul 30 '12 at 15:21

After some further research I think it's not possible.
At least on a level where one is not modifying the OS.

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Definitely not possible, the audio routing is something of a mutually exclusive/flip-flop principle.

If the headset is plugged in, the routing goes to the headset and is taken away from the in-built ear-piece. Vice-versa, if no headset is plugged in, the in-built-ear piece is used.

Likewise, for when during in-call without headset, audio routing goes to both ear-piece and mouth-piece, no other mp3/music cannot be played. For vice-versa, when no calls are happening, audio is routed to the speakers...

That shows what is actually involved in, what is known as "Audio routing" and is very complicated process hence the emphasis on mutual exclusivity/flip-flip operations of the audio fundamentals.

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