They can't hear me? 50% of the time

about half the time while using my phone, the person on the other line can't here me..
my mic works just find and I also tried using head phones and blue tooth head sets...
It only works when it wants to anyone know how to fix this. iRepair said the phone is 100%..

Hey there mahmoud.qaadan,
It sounds like you are making calls or receiving them but the other party cannot hear you even though the microphones work in other apps on your phone. I would start by quitting all the running apps on your device:
iOS: Force an app to close
http://support.apple.com/kb/ht5137
Double-click the Home button.
Swipe left or right until you have located the app you wish to close.
Swipe the app up to close it.
When you have done that and restart the device and test the issue again:
iOS: Turning off and on (restarting) and resetting
http://support.apple.com/kb/ht1430
If it persists, I would next backup your device to iTunes with this article:
iOS: How to back up and restore your content
http://support.apple.com/kb/HT1766
And restore it from your backup with this article:
Use iTunes to restore your iOS device to factory settings
http://support.apple.com/kb/ht1414
Thank you for using Apple Support Communities.
All the very best,
Sterling

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