Iphone 4 during a call can't hear or be heard. But I know both the speakers and the phone call mic work fine.

I bought an iphone 4 and have been having multiple issues since the moment I got it. My biggest issue when I received it was that the noise cancellation mic didn't work. I sent it back to the people I bought it from to fix it and they fixed the other mic but not the noise cancellation mic. So I know that one doesn't work with apps, speaker phone, that sort of thing. I've been just dealing with it and using headphones with a mic on them.
Well once I put my sim card in and had to go through a huge debacle with AT&T to do it, I got a phone call and I couldn't hear anyone and they couldn't hear me. I tried switching it to speaker phone and using my headphones and still nothing. I first tried factory reset and network reset and it didn't do anything. So I tried the fix where you put a piece of cardboard in the phone and the other fix where you loosen and then re-tighten the grounding screw. Now I can hear the other person but only on speaker phone, the call is choppy, but I can hear them so progress! They still couldn't hear me. However, when I took the call off of speaker phone it was back to dead silence. I tried putting in my headphones to see if they could hear me, they still could not hear me even with the headphone mic. I'm not sure what else I can do!! I know the speakers and mic work because I listen to music and play games and I hear those and when recording on voice memo the mic and playback work fine.I also know that it isn't any issue with signal because it happens where ever I am, low signal or all 5 bars! I guess I'll try cleaning them and try putting a thicker piece of cardboard but I don't expect those to work. If you can help with any suggestions at all please let me know! I have been having the worst luck with this phone and i'm getting absolutely fed up.

Hey there RJOBoston,
Take a look the article below, it provides troubleshooting tips that should resolve the issue you’re running into with not being able to hear or be heard on calls.
If you can't hear a person on a call or voicemail or if the sound quality is poor on iPhone - Apple Support
Cheers,
-Jason

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'''Try Firefox Safe Mode''' to see if the problem goes away. [[Troubleshoot Firefox issues using Safe Mode|Firefox Safe Mode]] is a troubleshooting mode that turns off some settings and disables most add-ons (extensions and themes).
''(If you're using an added theme, switch to the Default theme.)''
If Firefox is open, you can restart in Firefox Safe Mode from the Help menu by clicking on the '''Restart with Add-ons Disabled...''' menu item:<br>
[[Image:FirefoxSafeMode|width=520]]<br><br>
If Firefox is not running, you can start Firefox in Safe Mode as follows:
* On Windows: Hold the '''Shift''' key when you open the Firefox desktop or Start menu shortcut.
* On Mac: Hold the '''option''' key while starting Firefox.
* On Linux: Quit Firefox, go to your Terminal and run ''firefox -safe-mode'' <br>(you may need to specify the Firefox installation path e.g. /usr/lib/firefox)
''Once you get the pop-up, just select "'Start in Safe Mode"''
[[Image:Safe Mode Fx 15 - Win]]
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''To exit Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.''
When you figure out what's causing your issues, please let us know. It might help others with the same problem.
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