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I have a strange problem on my iPhone 8. The bottom mic is working fine for phone calls and also for recording audio on Messages. But when I use the mic for an app, for example Voice Memos, the sound is suddenly very faint and muffled. I've tried restarting, reset, updates, everything.
iPhone 8, iOS 12
The best advice is in the Related Article
If the microphones on your iPhone aren't working
After that you should arrange a service or repair
https://support.apple.com/iphone/repair/service
Anything other than Screen or Battery may be a replacement phone and the price is in the article.
If not covered by warranty and you don't have AppleCare+, you may have to pay full replacement cost for severe damage
You can see additional service information within the following article:
Get your iPhone, iPad, or iPod touch ready for service - Apple Support
The best advice is in the Related Article
If the microphones on your iPhone aren't working
After that you should arrange a service or repair
https://support.apple.com/iphone/repair/service
Anything other than Screen or Battery may be a replacement phone and the price is in the article.
If not covered by warranty and you don't have AppleCare+, you may have to pay full replacement cost for severe damage
You can see additional service information within the following article:
Get your iPhone, iPad, or iPod touch ready for service - Apple Support
iPhone 8 mic issue
