Audio not working

The audio on my phantom 3 standard not working. No known reason. Is there something I rnay of turned off.

Which audio are you referring to?

Sound to cell phone recording.

There is no such thing that I know of.

When I record flying thru control app. Video and sound.

That is a function of your phone, not the app or the Phantom. The Phantom does not record audio.

Ok, thanks.

There is a feature in DJI GO 4 (see below) that allows sound from your mobile device to be recorded with the cached video. That setting is not available in DJI GO (3) though.