Released on September 19, 2014, this 5.5" screen iPhone is the larger version of the iPhone 6.

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Strange screeching sound during calls, comes and goes


I have an iphone 6 Plus and sometimes during a call (happens randomly), It begins to do this weird high-pitch screeching and then the microphone stops working. I have gone ahead and replaced the top speaker and also the lighting cable/headphone connector piece so far and it still happens every now and then. It does go away when I restart the phone.

Maybe the lower microphone?


Update (05/08/2017)


Started happening again. I cannot hear or speak when trying to make calls. Went and did a few more tests, I can watch a youtube video and also listen to my voicemails both through small and loudspeaker so it probably something you mentioned above.

Tried DFU restore and we will see. Not too sure how to repair baseband circuit if even possible.


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Thanks for your reply.

I did replace the speaker box.

iPhone 6 Plus Earpiece Speaker

I have also replaced the headphone jack

iPhone 6 Plus Lightning Connector and Headphone Jack

Hmm, really think is the audio bracket? Never had an issue with that or the front camera....Guess it could be huh?


What iOS version?


Dangit, we got too excited in conversation. Thanks @rany I definitely think it could be the flex, as that powers the speakerbox. As usual Rany is right. New problems come from new iOS and we've seen a rash of front camera flex problems, the past couple few weeks


Did someone ask OP if it happens on both speaker phone on and off during calls?


Im on 10.3.1

I haven't thought about testing the speakerphone theory...Next time it happens I will try it out. I just find it interesting about the weird sound and then the microphone not working...Hmm.

I can confirm everything is fine when connected to a 3rd party item via bluetooth.


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You replaced the speaker box?

iPhone 6 Plus Earpiece Speaker

I would've gone with the flex

iPhone 6 Plus Front Camera and Sensor Cable

Also, could be the audio control cable

iPhone 6 Plus Audio Control Cable and Bracket

iPhone 6 Plus Audio Control Cable and Bracket Image
iPhone 6 Plus Earpiece Speaker Image
iPhone 6 Plus Front Camera and Sensor Cable Image

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@theimedic where've you been? Until this I haven't seen any posts for days.


The little lady was out of the country. Me and the guys decided to do a non stop party. Workin on gettin that 360, so we can jam @pccheese


A 3 day party? You must of had one !&&* (opposite of heaven) time!

Definitely don't go out of your way to get that 360. Even if you could get it free, XB live is $60 for a year plus a game. Besides, my dad probably wouldn't even let me do voice chat.


Yeah. I partied very hard, most of my life. I've always worked very hard. Usually double job. But party every night. Now I'm in love and everything and settling down. But if she's out of country? Also I was very..."tired" so it wouldn't be appropriate for me post here. Ah, yeah...I've thought about that. How to be respectful towards your family. I think it's important. The money? Dude, when you get here, where I'm at? And you will. $120? Not a lot of money. Also the rest of the money is supposed to be used to help people. Help as many as you can. We were out this weekend, and stopped to help a woman change a tire, before we went to the next party


And protect your neck! Always make sure your protected! So many bad people out there. Disgusting. Always make sure you're taken care of


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First rule out bad housing preferably by testing in new housing.

Otherwise noise during cellular calls only = codec IC or baseband circuit failure. Or software. You can try a DFU restore to rule out the latter. But you may end up with error -1 if the baseband circuit is failing.

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Both of these guys were too nice, genuinely nice people. And they let people get over on them. They accepted hand shake deals. Hand shakes don't mean anything in this day and age. Always make sure your interests are taken care of and be fair to your business partners

Aaron Swartz

RIP Never forget

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iMedic, believe me, I'll never end up like those two.

A. Suicide is against my religion.

B. I'm perfectly aware of this day and age. I was born 2003, but I can still relate to the days when you could put something on your "Tab" or go outside go meet some friends for whatever.

C. My great-grandfather worked at the slaughter house and later owned low-end apartments. My Grandpa used to own a corner grocery store, along with the apartments (You should hear some of the stories he's told), and later started a candle making business with my Dad and Uncle. Now, we've moved are candle business to California. About 13 years ago my Dad and Uncle started a company called Benchcrafted.



You say that now. I'm just advising you, watch out what you're doing and who you're with, as we move into the fight for the digital frontier. That's all I'm saying


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