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iPhone 4 microphone not working - Apple Community
https://discussions.apple.com/thread/2500093
iPhone 4 microphone not working. I have been told that my new iPhone 4 (16Gb) will have to be replaced as the microphone does not work, whatever I do, and despite resets and restores. I can make and receive calls on the speakerphone (with considerable distortion), but the basic microphone does not operate in any application.
SOLVED: No voice and mic - iPhone 4 - iFixit
https://www.ifixit.com/Answers/View/92759/No+voice+and+mic
It sounds like the audio decoder. This is a fairly common problem with the 4 and 4S. Apples policy is to swap the phone out for a replacement but that's useless for phones over 12 months old. If your iPhone is under 12 months old take it straight to your nearest apple store. Symptoms are exactly as you've described.
If the microphones on your iPhone aren't working - Apple ...
https://support.apple.com/en-us/HT203792
Open the Voice Memos app. Tap the Record button , speak at the bottom of your phone, then stop the recording. When you play back the memo, you should hear your voice clearly. If you don't hear your voice clearly, contact Apple Support. If people can't hear you when you're using speakerphone Open the Camera app.
iPhone 4 bottom mic doesnt work when making calls - …
https://www.ifixit.com/Answers/View/85198/iPhone+4+bottom+mic+doesnt+work+when+making+calls
Iphone 4 lower microphone stops working. recording video and memos works fine, but people cant hear me during calls. just to clear things up for everyone... when using video recording, memos or anthing else that can record your voice, the iphone is using the TOP MICROPHONE. when calling/getting calls the iphone will be using the LOWER MICROPHONE.
FIX No Sound In Calls or Mic Not Working On Any IOS ...
https://www.youtube.com/watch?v=1wKi5aQgCfw
Up to date guide Dec 2020: https://youtu.be/4-k-lRZiPr8This is another problem we have found to cause sound problems - Iphone Mic Problem Is It Hardware Or ...
My iPhone Microphone Is Not Working! Here's The Fix.
https://www.payetteforward.com/iphone-microphone-not-working-heres-fix/
If your iPhone doesn’t have Face ID, double-press the Home button. Then, swipe your apps up and off the top of the screen. Clean The Microphone If you find that one of your iPhone’s microphones sounds muffled after you test it or it has no sound at all, let’s clean them.
Internal Apple Microphone - Studio Six Digital
https://studiosixdigital.com/audio-hardware/generic-audio-hardware/iphone_3gs_microphone.html
For iPhone 3GS, iPod touch 3, and older models, this input was analog. Starting with iPhone 4, iPod touch 4, and iPad, these newer models provide only a digital audio input on this connector. This is a high-quality digital audio link, and provides and excellent signal path in and out of iOS devices. There is no analog input on any current iOS ...
Adjust the audio settings on iPhone - Apple Support
https://support.apple.com/guide/iphone/audio-settings-iph3e2e2cdc/ios
Adjust the audio settings on iPhone You can adjust the mono audio and left-right stereo balance to suit your hearing needs. You can also turn on noise cancellation to reduce ambient background noise on phone calls. Go to Settings > Accessibility > Audio/Visual. Adjust any of the following:
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