Q: Iphone 4 people cant hear me during calls.

So I wrote about having this problem on March 11. Have found a solution albeit temporary and a little dodgy. When it becomes apparent that others can't hear me I whack the back of the phone and presto they can hear me for the rest of the call. No joke. What's with that?

Again:
Problem is with the voice encoder. It only affects phone calls and that's why it doesn't affects other apps.
If you wack it, you fix it but for a small time. It's a bad contact.
The only solution is to go to your Apple store and ask for a new one , or open, find the voice encoder and try to fix the bad contact.
Can't believe so many shi tty phones (mine included)

It happened again this afternoon during an incoming call. I whacked it on the back with my hand and it started working as someone recommended in another post. Obviously, something's wrong, and another poster said the contact is bad and Apple should replace the phone. I'm not positive that's the problem, though. It makes sense but what about my case (big Otterbox) confusing the proximity sensor or iOS screwing up with 4.3? Right now, for my iPhone, I think it's the loose connection since a whack obviously had to "adjust" something physical, not software, though maybe the proximity sensor is affected by a whack, too. WHAT A PAIN TROUBLESHOOTING A FRIGGN PHONE BECAUSE THE MANUFACTURER IS ACTING LIKE JAPANESE NUCLEAR REACTOR OPERATOR. APPLE -- THE NEW TEPCO. THANK GOD APPLE DOESN'T OPERATE NUCLEAR PLANTS OR WE'D ALL BE FRIED.

I sent my phone to service. I'm reporting results after it comes back (estimate: 1-2 weeks)

Same problem from my side, with same effects. Clearly it is an internal hardware connection; sometimes the voice is totally lost, in other cases you can hear a crispy noise (like bad cable connectivity)

I can (sometimes) recover it by pushing firmly with the index finger in the middle back part of the iPhone during the call.

I sent my phone for the second time back to Apple (first time they said "problem can't be reproduced"). I hope this time they fix it or replace the device. Will keep you informed.

I had that problem, but I just fixed it! I opened the voice memo app and then closed it again. And now it works again! Try closing any app that may be using the mic, in my case was the voice memo app, but try others too if that one does not work.....

Hope this helps....

Sounds like Apple has varying hardware AND software issues with iPhone 4's audio input.

In my case and in many others', turning off the phone and even hard resets, which turn off all background apps, too, didn't/doesn't help. I almost never use any other voice apps, plus physically smacking the back of my iPhone restored audio input, greatly implying a hardware problem.

With my iPhone 4, the only way I could see that the problem still might be only software-related is if the software driver(s) that controls one or more audio-input-related hardware misinterprets/ignores/loses contact with hardware until a physical jolt causes the hardware to send a signal/data large enough that the software driver notices. This seems unlikely to me, so I currently greatly lean toward hardware problem as the culprit.

Isn't this pathetic that Apple leaves its consumers to figure this !@#$ out! Here we are on Apple's own forum, stumbling through the night of audio input problems on a PHONE as its manufacturer sits idly by eating a sandwich while reading our posts. Apple wants to be a consumer electronics company and not just a computer company, but that's a pipe dream FAIL.

If Steve Jobs goes, Apple will experience the 1990s all over again. But at least next time Linux/UNIX will have better support via Droid, which has the advantage of not being propped by an inherently unstable cult of personality benevolent dictatorship.

Here's the definition of telephone from dictionary:
"...a system that converts acoustic vibrations to electrical signals in order to transmit sound, typically voices, over a distance using wire or radio." But to Apple it's no big deal that its PHONE often can't do that!

Hey there,

I have iPhone 4 on 4.2.1 (so it's not the 4.3 update for my case) and started experiencing this problem a couple days ago... people couldn't hear me during a phonecall, but my microphone worked fine when I tried to use Voice Recorder. Fed up with Apple's forum not quickly displaying answers, I went somewhere else and discovered that sometimes dust gets into the headphone jack which causes the phone to think headphones are plugged in. In this case, using speakerphone will work, or TO FIX IT, you can simply clean the headphone jack. I plugged in headphones a few times and blew air into it, then reset the phone to be sure, and it worked!
(Btw, it was not fixed by the reset, as I tried that before cleaning the jack, and it didn't work... But I felt an extra reset after the cleaning couldn't hurt)
If this doesn't work, many other causes have been suggested on the forum... Just go to the latest posts right away, as earlier posts are all the same question over and over.

In mine and many others' case posted in the this forum, no audio input works during an iPhone 4 call: not the speakerphone, regular mic or even the physical headset jack. Only whacking the back of the phone restores audio input.

Surprise, surprise... Apple for the second time sending my iPhone to service center "did not manage to replicate the issue"... Which is the next step?

Greetings to all. At me iphone 4 РСТ (i.e. certificated in Russia).
I had just the same problem with a microphone, the insertion always was 4,2,1. Glitches periodically repeated.
But approximately 4 days ago I перепрошил on 4,3,1, have thus risen the version of the modem and the version of the operator. Why that the glitch didn't repeat yet, though even I tap it sometimes)) to provoke.

Someone tried to update to the last insertion? Glitches remained?

So after a couple postings to this topic now after the upgrade to 4.3.1 the problem has stopped. Made numerous calls and know issue.

Someone else tried to be updated to 4,3,1? Or it is simple coincidence and a problem still will appear, or the decision in update of the modem to the last version.

I've upgraded to 4.3.1 but problem still occurs. It's not software bug.

I have the same problem with my iPhone4. It's been happening for 2-3 weeks now off and on. There is no rhyme or reason when it happens. When it happens the only way for me to fix it is to reboot the phone, and then I can call the person back and they can hear me.

I did break my screen about 6 weeks ago and sent it out and had it fixed. I don't know if that voids the warranty or what. I'm wondering if this is part of the problem.