Iphone 13 Pro Max microphone wont turn on

Thanks for posting in the Apple Support Communities syd215,

The steps below may provide a solution if you're encountering microphone issues on your iPhone:

Clear the microphones

1. Remove any screen protectors, films, or cases from your iPhone.

2. Clear any debris from the openings of your iPhone. 

If people can't hear you on phone or FaceTime calls

1. Open the Voice Memos app. 

2. Tap the Record button , speak at the bottom of your phone, then stop the recording. 

3. When you play back the memo, you should hear your voice clearly.

If people can't hear you when you're using speakerphone 

1. Open the Camera app.

2. Record a video while speaking at the top of your iPhone.

3. Tap the camera chooser  to switch to the other camera. Then record another video while speaking at the top of your iPhone.

4. When you play back the videos, you should hear your voice clearly.

If the microphone doesn't work in a specific app

1. Go to Settings > Privacy > Microphone.

2. Make sure that the app is enabled.

3. If the app has permission to access your microphone, or if it isn't listed, contact the app developer.

Contact Apple Support

If you still sound unclear during calls, recordings, or apps, contact Apple Support to discuss service options.

If the microphones on your iPhone aren't working

We hope this helps!