loud piercing noise while talking on iPhone 6 plus

My issue is also with the LifeProof case. No problem when I use a different case or no case at all.

I sent a trouble ticket to LifeProof and this is what the response was:

Hello! We have found that a small number of people calling someone who has LifeProof'd their phone have difficulty hearing the LifeProof talker on regular phone calls. Fortunately, the cause is very simple and so is the fix:

CAUSE

The microphone has a special thin vent that keeps the water out but allows sounds to pass. This normally works perfectly and allows crystal clear calls. However, with some cases when the air trapped in the case causes a positive pressure, the vent is puffed outwards by air pressure a little and then it stretches out to touch the little protective grills (Keeps foreign objects from damaging the sensitive vent) in the bottom of the case. Sometimes the vent then rests against these grills after being stretched to that position and then cannot vibrate correctly to transmit the sound to the phone microphone – causing a distant, thin, tunnelish kind of voice to be heard on the other end of a call.

SIMPLE FIX

Look at the phone front-on as you would when you are about to start an app. The microphone port is the hole on the bottom of the case to the lower left of the home button and left of the charge port.

Blow hard into the microphone for about 3 to 4 seconds. The sufficient effort require is akin to blowing a candle out. You could also pretend you were blowing up a balloon by sealing your lips over the hole and then blowing.

This air pressure will push the vent away from the protective grills and liberate your phone to crystal clear sound on video recording and phone calls again. You may (or may not) need to do this from time to time if large air pressure changes cause the vent to flex to stick to the protective grill again.

Also, remember to always thoroughly shake water out of the vent area after being submerged because trapped water in the protective grill will also attenuate the sound.

If this doesn't fix the problem, please reply back to this email.

****FIX 2****

Turn off your 'Background Noise Cancellation' in your phone settings.***

****FIX 3****

Turn off phone. Remove from case. Replace in case. Turn phone on once completely secure inside. The device will recognize when it is in/out of case.

***If you turn off your Background Cancellation Noise in your settings, this will resolve all audio issues.

Launch your Settings app with a tap, then tap the General button. Next, find the Accessibility tab and tap there. Swipe down to the Hearing section to find the Phone Noise Cancellation toggle. Tap on the switch to the right to set it Off.

This should help you with any odd sensations caused by noise cancellation when you’re using your iPhone. To turn the feature back on again, simply toggle the switch back to On.

Read more at http://www.cultofmac.com/275481/disable-phone-noise-cancelation-iphone-ios-tips/ #2sC7rUaqYz0YgvfM.99

My stepfather had the same issue for his 4S iPhone - To to General - Touch reset network - reset network settings - Now iPhone will reboot. And then the network settings will go back to default network settings. His iPhone no longer makes the screeching noise.

I think its the same to reset the network settings as all the other iPhones; but not sure

Asiangem

Did you ever figure out a solution to this problem? I'm having the SAME issues- no case but I have a 6s. Let me know if you ever figured out what to do!

Hi guys am also having the same problem , my microphone works well but when most of the times , when am in a phone call , it gets muted and cant hear anything and phone call ends up within a second automatically , any permanent solution for this one? I didnt update my ios to 9.2 . phone noise cancellation is toggled off. hearing aid is also toggled off.

I have a camo and orange otter box and it just started making the high pitch noise about a week ago. Any suggestions??