I scoured the Internet for a fix, and I've found a few hints that narrowed my problem down.
SYMPTOMS (With Microphone, Ear Buds, or Bluetooth):
I call and callers can't hear me.
In/Out calls work for a few seconds, then callers can't hear me all of a sudden.
All other applications that use the iPhone microphone work, yet phone app on does not.
HINTS FROM INTERNET:
Loose back glass screws.
Put pressuse on left or right bottom corners of iPhone 4.
While testing (facing the back glass), I made calls and put pressure on the left and right sides of the bottom of the iPhone 4. Sure enough, not one could hear me unless I pressed the right bottom of the ihone 4. Once I let go, they can't hear me again. Putting pressure back on, they can hear me.
FIX (So Far):
I unscrewed the bottom two screws and removed the back glass. I pre-cut a piece of manila folder about one square inch, and layed it inside the back bottom right, and put the back glass back on. My theory is that the piece of manila folder put just enough pressure on the internal components so that I did not have to manually do it.
DISCLAIMER: This is just my fix. I, nor this forum, take any resposibility for damages to your iPhone if you attempt this process.
i have the same problem and seems to be the mic, because the sound recorder doesnt work either
it seems to be a hardware problem dude!!!
- de ariot
My friend has the same problem. We tried Skype Test and everything went fine. We recorded a show on tv via video recorder and it's fine so it means that the microphone is working fine. Viber is also working good. It's only when we are using the normal phone to call... The thing is that my voice is mirrored back as an echo but the other line cannot hear me. that is the problem
- de jamiro
I have this problem for my phone too but I have an iPhone 5s. I can hear the other party but they can't hear me unless I talk on speaker phone. Has anyone had this problem with the iPhone 5s?
- de Blaise
When making a phone call with my iPhone4, the other party can't heard me and neither that I, once I turn it on speaker it's ok. What should I do??
- de Cristal Salgado
cristal there are lots of posts on ifixit regarding this problem. most likely it is the microphone on your dock connector which will need replacing. have a quick look at the "solutions" under the photo of the iphone 4 on this page...
- de pollytintop
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