How to Fix an iPhone Microphone That Others Cannot Hear

An iPhone microphone that prevents callers from hearing speech usually has a blocked microphone opening, disabled app permission, Bluetooth audio routing, software failure, or hardware damage. Remove the case, clean the microphone openings carefully, confirm microphone permissions, and test the microphone with Voice Memos before arranging service.

Steps

Remove obstructions. Remove the case, screen protector, or film near the bottom microphone. Gently brush away visible dust with a clean, dry, soft brush. Avoid liquids, sharp tools, and compressed air.
Test microphone recording. Open Voice Memos, record a short sentence, and play the recording. Clear audio indicates that the microphone works and that the problem may affect a specific call app, Bluetooth device, or cellular connection.
Check microphone permissions. Open Settings > Privacy & Security > Microphone. Enable microphone access for Phone, FaceTime, WhatsApp, or another affected app.
Disconnect Bluetooth audio. Open Settings > Bluetooth and turn Bluetooth off temporarily. A connected headset, car system, or hearing device can route call audio away from the iPhone microphone.
Restart and update the iPhone. Restart the device, then open Settings > General > Software Update. Install an available iOS update and test another call.

Common Issues and Fixes

People cannot hear speech during every call: A blocked or damaged bottom microphone is likely. Clean the opening and test Voice Memos; persistent failure requires Apple or authorized repair service.
The iPhone microphone works in Voice Memos but not in one app: The app may lack permission or contain a software fault. Enable microphone access, force-close the app, and install the latest app version.
iPhone microphone audio sounds muffled during calls: Dust, a poorly fitted case, moisture, or a covered microphone opening may reduce clarity. Remove accessories and allow moisture to dry completely before testing.
Only cellular calls have a microphone problem: A carrier, network, or Phone app issue may be involved. Test FaceTime or another calling app, then contact the carrier if cellular calls remain affected.
Callers hear silence after an iOS change: A temporary software conflict may exist. Restart the iPhone and install pending iOS updates before considering Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings. Network settings reset saved Wi-Fi passwords.

Quick Tips

Test the bottom, front, and rear microphones because different apps may use different microphone locations.
Remove a screen protector if the protector covers the earpiece or front microphone.
Do not insert pins into microphone holes or apply cleaning fluid.
A drop, liquid exposure, or failed Voice Memos recording strongly suggests hardware damage.

Why can people not hear speech on an iPhone but recordings sound normal?

The affected call app may lack microphone permission, or Bluetooth may be routing call audio to another device. Check permissions and disconnect Bluetooth before testing again.