iPhone 7, 7 Plus Have a Microphone Problem | PCMag
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SOLVED: Microphone not working on iPhone 7. (Phone Calling and Siri) - iPhone 7 - iFixit
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Apple iPhone 7 Microphone Problems: No sound, Static or noisy background, audio cutting out, microphone not working [Troubleshooting Guide]
The Most Common iPhone 7 Problems, and How to Fix Them | Digital Trends