How to Fix a Phone Microphone That Stopped Working
2026-10-14 · Marion Phone Repair
You call someone and they say they cannot hear you, or your voice sounds muffled, distant, or robotic. Voice memos record silence or heavy static. Video recordings have no audio or faint, distorted sound. A microphone that stops working makes the phone nearly useless for its most basic function — being a phone. The good news is that many microphone problems are caused by software settings, blocked mic openings, or Bluetooth conflicts rather than actual hardware failure.
Check which microphone is affected
Most modern phones have multiple microphones — typically three: one on the bottom edge (primary, used for calls), one near the front camera (used for speakerphone and video), and one on the back or top (used for noise cancellation). Figuring out which microphone is failing narrows the diagnosis:
Test the bottom microphone. Make a regular phone call (not speakerphone) and ask the other person if they can hear you. Or open a voice recording app and record yourself speaking with the phone held normally
Test the speakerphone/front microphone. Make a call on speakerphone. If the other person hears you clearly on speakerphone but not on a regular call, the bottom microphone is the problem
Test the video microphone. Record a short video and play it back. Video typically uses the microphone near the rear camera. If video audio is fine but calls are not, the bottom microphone is the issue
If all microphones fail simultaneously, the problem is almost certainly software (a setting, an app conflict, or an OS bug). If only one fails, it is more likely a hardware problem with that specific microphone.
Clean the microphone openings
The microphone openings on a phone are tiny holes that easily get blocked by lint, dust, dirt, and debris from pockets and bags. A blocked microphone sounds muffled, distant, or like you are talking through a pillow:
Find the microphone holes. On most phones, the primary microphone is a tiny pinhole on the bottom edge near the charging port. The secondary microphone is usually near the front-facing camera (often in the earpiece grille) and the third is near the rear camera
Clean gently. Use a soft-bristled brush (a clean, dry toothbrush works well) to brush across the microphone openings. Do not push debris into the hole — brush across it to sweep debris away
Compressed air. A short burst of compressed air aimed across (not directly into) the microphone opening can dislodge lint. Use short bursts at a slight angle, not sustained high-pressure air directly into the hole
Check for case interference. Some phone cases cover or partially block microphone openings, especially thick rugged cases or cases with port covers. Remove the case and test the microphone without it
Check app permissions
If the microphone works for calls but not for specific apps (voice memos, video recording, a messaging app), the app may not have permission to access the microphone:
iPhone
Open Settings, then Privacy and Security, then Microphone
Find the app in question and make sure the toggle is enabled
Android
Open Settings, then Apps, find the app, then Permissions
Tap Microphone and select Allow or Allow only while using the app
Also check if Microphone Access is enabled system-wide. On Android: Settings, Privacy, Permission manager, Microphone. On iPhone: Settings, Privacy and Security, Microphone — the master toggle should be on.
Disconnect Bluetooth devices
One of the most common causes of apparent microphone failure is an active Bluetooth connection routing audio to another device:
Bluetooth earbuds or headset still connected. If your Bluetooth earbuds are in their case but still connected to the phone, calls may be routed to the earbuds' microphone instead of the phone's microphone. The earbuds' mic, being in a closed case or across the room, picks up nothing — so the other person hears silence
Car Bluetooth. If the phone connected to your car's Bluetooth and you are now inside your house, the call may still route to the car system. Disconnect Bluetooth or toggle it off temporarily to test
Fix: go to Settings, Bluetooth, and either disconnect or forget the device. Then test the microphone again. If the mic works with Bluetooth off, the issue is the Bluetooth audio routing, not the phone's microphone
Restart the phone
A restart clears temporary software states that can interfere with microphone access. An app crashing, a voice assistant hanging, or an audio process getting stuck can all block other apps from using the microphone:
iPhone: hold the side button and either volume button, slide to power off, wait 30 seconds, turn back on
Android: hold the power button, tap Restart
If the microphone problem started suddenly (it was working yesterday), a restart is the first thing to try and often fixes it immediately.
Check for Do Not Disturb or Focus modes
While Do Not Disturb and Focus modes do not directly disable the microphone, some configurations can affect call audio behavior:
iPhone Focus modes can silence calls entirely, which might be mistaken for a microphone problem if the call never connects properly
Android Do Not Disturb can block calls. If you think your microphone is not working because people say they cannot reach you, check DND settings first
Update the phone software
Microphone bugs are occasionally introduced by OS updates and fixed in subsequent patches. If the microphone stopped working after a recent update:
Check for a newer update (Settings, General, Software Update on iPhone; Settings, System, Software Update on Android) — the fix may already be available
Search online for your phone model + software version + microphone problem. Known bugs are usually well-documented on forums, and workarounds may be available while waiting for a patch
Reset all settings
If none of the above fixes work, resetting all settings restores every system setting to its default without deleting your files, apps, or data:
iPhone: Settings, General, Transfer or Reset iPhone, Reset, Reset All Settings. This resets Wi-Fi passwords, Bluetooth pairings, privacy permissions, sound settings, and display settings. Your photos, apps, and data stay intact
Android: Settings, System, Reset options, Reset all settings (wording varies by manufacturer)
After the reset, you need to reconnect to Wi-Fi and re-pair Bluetooth devices, but any setting that was blocking the microphone will be cleared.
Signs of hardware failure
If software troubleshooting does not fix the problem, the microphone hardware may be damaged:
Microphone stopped working after a drop. Impact can break the microphone component or disconnect the flex cable that connects it to the logic board
Microphone stopped working after water exposure. Water in the microphone opening corrodes the component. Even water-resistant phones (IP67/IP68) can have microphone failure from moisture because the microphone openings are not sealed — they need to be open to pick up sound
Only one microphone failed. If the bottom microphone does not work but the speakerphone microphone does, the bottom mic component or its connection has failed. This is a targeted hardware issue, not a software problem
Crackling or distortion that does not clear. Static, buzzing, or crackling during recordings that persists across all apps and after a restart suggests a physically damaged microphone element
Microphone repair in Marion
Marion Phone Repair diagnoses and fixes microphone problems on iPhones, Samsung Galaxy, Google Pixel, and other phones. We test each microphone individually, check flex cable connections, clean debris, and replace failed microphone components. Most microphone repairs are completed same-day.