"Prepare iOS for Recording" re-routes audio output via earphones only when recording?

Unity Engine
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1

Reading Unity manual, I see that description for Prepare iOS for Recording is:

So, if I check “Prepare iOS for Recording”, then the audio will be played via earphones always? Or only while recording (between Microphone.Start and Microphone.Stop calls)?

2

I would also like to know this, I did a test and sound played out of the speakers fine but I am nervous that in a non-development or official build that I submit to an app store will have different behavior.