The person on the other end of the call can’t hear you — your voice is cutting out, muffled, or completely silent. It’s one of the more frustrating iPhone problems because you often don’t know it’s happening until someone tells you. The cause is usually one of a few things: a blocked mic, a software setting, or a third-party app that’s interfering with the microphone. Here’s how to track it down.
Figure Out Which Microphone Is Acting Up
Your iPhone has multiple microphones — one at the bottom near the Lightning or USB-C port, one at the top, and one on the back near the rear camera. Different situations use different mics. Regular phone calls use the bottom mic primarily. Speakerphone and video calls often switch to the top or rear mic. FaceTime and voice memos primarily use the front-facing mic.
A quick way to test: open the Voice Memos app, record 10 seconds, and play it back. If it sounds muffled or silent, the issue is hardware or a software block. If it sounds fine in Voice Memos, the problem is specific to calls — which usually points to settings or a blocked earpiece rather than a dead microphone.
Check for Physical Obstructions
The bottom microphone on iPhones is tiny and easy to block. Common culprits include cases that cover the mic grille, lint and debris packed into the bottom port area, and screen protectors that extend too far toward the earpiece. Take your case off and look at the bottom of the phone. You can use a dry toothbrush or a can of compressed air to clear out any debris — just don’t use anything sharp or wet.
Same goes for the top earpiece — if people can’t hear you clearly in normal call mode (not speakerphone), lint or debris in the earpiece slot could be blocking both audio output and the mic pickup near it.
Check Microphone Permissions
If the problem is happening in a specific app — say, FaceTime works but WhatsApp calls are silent — check whether that app has microphone access. Go to Settings > Privacy & Security > Microphone and make sure the toggle is on for the apps that need it. If an app’s toggle is off, it simply won’t be able to pick up any audio from you.
Disconnect Bluetooth Audio Devices
This one catches a lot of people off guard. If you have AirPods, a Bluetooth headset, or a car connected, your iPhone might be routing audio to that device instead of the built-in mic. If your AirPods are in the case nearby, the phone might still be trying to use their microphone — and not getting a clean signal.
During a call, tap the audio button and make sure the output is set to iPhone — not a Bluetooth device. You can also go to Settings > Bluetooth and temporarily disconnect any paired devices to test if that’s the issue.
Restart Your iPhone
It sounds simple, but a lot of microphone issues are caused by a process that’s gotten stuck. Restarting the phone clears out those background processes and resets the audio system. Hold the side button and a volume button, slide to power off, wait 30 seconds, and power back on. Then test with a call or Voice Memos again.
Update iOS
Apple has patched audio bugs in iOS updates before. If you’re running an older version of iOS, a bug in the audio routing system might be causing the problem. Check Settings > General > Software Update and install anything available.
Reset All Settings
If the microphone works in some contexts but not others and you can’t figure out why, a settings reset can rule out any misconfigured audio routing. Go to Settings > General > Transfer or Reset iPhone > Reset > Reset All Settings. Your apps and data stay intact — only system settings go back to default.
When It’s a Hardware Problem
If you’ve been through every software fix and the microphone is still silent or muffled on every call, the mic itself may be damaged. This can happen from drops, water exposure, or just general wear over time. At that point, you’re looking at a repair — or a replacement.
If the repair cost doesn’t make sense for an older phone, it might be worth upgrading instead. You can find solid deals on used iPhones on Swappa — every listing includes photos from the actual seller, so you know what condition the phone is in before you buy.
Start with the physical check and the Voice Memos test — those two steps will tell you quickly whether you’re dealing with a hardware issue or something fixable in settings.
