IPhone mic not working in calls?

Yes I understand this has been asked before, but I can't find a direct answer. My friends iPhone 4 mic WILL work with FaceTime, record videos ect. And you can hear her but when you call her (no its not on mute and her mic isn't muted) you can't hear her at all. We already tried the hearing aid in access ability so it's not that. Any advice?

Iphone 4 and up they use 2 different mics.
one on the top right by the earphone jack and the other one on the bottom next to the speaker.
the one on the top is for video recording and facetime call and when you use the loud speaker
and I can assure you that the one on the bottom is the one that got messed up
that's the whole reason why it only works when the loud speaker is on or when you face call some one… You need to replace the mic that goes on the bottom of the phone and then it'll work again.

  • My iphone is working but not taking incoming calls? Any thing ican do to fix? When i call my iphone from another phone it rings but nothing comes up on the iphone also i can't call out from the iphone, when i call nothing happens. Any ideas? Is working! Can still use apps and what's app to send msgs
  • My iPhone 6+ mic isn't working? My voice text isn't working, neither is Siri. I tried using the Voxer app. Doesn't work. But voice memos work perfectly. I had a screen replacement and now it doesn't work!
  • My external mic isn't working? Someone So I just received my external mic for my Iphone, it has the end of like an aux cord so it fits in my phone and I don't need an adapter. But when I tested it, sound only recorded from the built in microphone and not the external mic. The phone seems to be recognizing it as headphones instead of a mic, is there a setting I need to change?!
  • Mic on iPhone 4 not working? I have the iPhone 4 running the latest iOS. I can't talk, because the other person can't hear me. I can record voice memos, it comes out blank. But I can record my voice using the video recorder. It's a used iPhone, but the last time the mic didn't work was over a month ago.