"My iPhone microphone doesn't work" is actually three different problems, because your iPhone has three different microphones. There's one at the bottom edge (the primary mic, used for phone calls and Voice Memos), one on the front near the earpiece (used for FaceTime and front-camera video), and one on the back next to the rear cameras (used when you shoot regular video). When someone says "people can't hear me on calls but my videos sound fine," that single sentence already tells a technician which mic is dead. So before you try a single fix, spend 60 seconds finding out exactly which microphone — if any — has actually failed.
The 60-Second Three-Mic Test
Do these three recordings in a quiet room, speaking at normal volume:
- Bottom mic — Voice Memos. Open the Voice Memos app, record 10 seconds of speech holding the phone normally, and play it back. This tests the primary microphone at the bottom edge.
- Back mic — rear video. Open the Camera app, switch to Video, record 10 seconds with the rear camera while talking, and play it back. This tests the microphone next to the rear camera lenses.
- Front mic — selfie video or FaceTime. Flip to the front camera, record 10 seconds of video, and play it back. (A FaceTime call to a friend works too.) This tests the front microphone near the earpiece.
Then make one normal phone call and one speakerphone call and ask the other person how you sound.
Reading Your Results
- All three recordings are silent or barely audible: a single dead mic can't explain that. Suspect something covering or hijacking all the mics — a case, a stuck Bluetooth connection, or a software problem. Start with the software fixes below.
- One recording is bad, the others are fine: you've isolated a hardware fault to one specific microphone. Software fixes are worth two minutes of your time, but expect this to need a repair.
- Recordings are fine but callers can't hear you: classic bottom-mic-path or software issue — and very often it's Bluetooth. Keep reading.
- You sound muffled or robotic, not silent: a blocked or corroded mic port. Jump to the cleaning section.
Fix 1: Disconnect Bluetooth (the Embarrassingly Common One)
If your iPhone is still paired to AirPods buried in a bag, a car stereo, or a smartwatch, it may be sending your voice to that microphone instead of its own. Swipe into Control Center, long-press the audio card, and check where the audio is routed — or simply toggle Bluetooth off entirely and repeat the call test. This one fix resolves a remarkable share of "microphone failures."
Fix 2: Check App Permissions
If the mic fails only in specific apps — WeChat voice messages, Zoom, Instagram — but Voice Memos records fine, iOS has probably denied that app microphone access. Go to Settings → Privacy & Security → Microphone and make sure the toggle is on for the app in question. While you're in Settings, install any pending iOS update; mic-routing bugs do get patched.
Fix 3: Take Off the Case and Screen Protector
Thick or badly fitted cases are notorious for partially covering the bottom mic holes, and some screen protectors creep over the front mic opening near the earpiece. Strip the phone completely bare and repeat the three-mic test. If naked recordings sound noticeably better, you've found your culprit — replace the case, not the phone.
Fix 4: Restart, Then Clean the Mic Ports
Restart the phone first — it clears stuck audio routing. Then look at the mic openings with a flashlight: the small holes on the bottom edge, the tiny hole near the rear cameras, and the slit near the earpiece. Pocket lint, dust, and dried gunk build up over years and physically muffle the sound. Clean gently with a soft, dry toothbrush or a wooden toothpick — never compressed air at close range (it can rupture the mic membrane), never pins or needles, and never any liquid. If you sounded muffled before, retest now.
The Water Aftermath Problem
Here's the pattern we see weekly at our stores: a phone survives a splash or a quick dunk, everything seems fine, and then two or three weeks later the microphone starts cutting out — working on some calls, muffled on others, then dead. Microphones are usually the first casualty of liquid exposure because the mic membrane sits behind a mesh that traps moisture, and corrosion eats the contacts slowly. If your mic trouble started sometime after any contact with liquid — rain, a sweaty pocket at the gym, a bathroom counter — assume corrosion until proven otherwise. Don't wait for it to "dry out"; corrosion only spreads. Our water damage guide covers the full first-aid protocol, and professional cleanup runs $99–$149 depending on model.
What You Can Fix Yourself vs. What Needs a Shop
At home: Bluetooth routing, app permissions, cases and protectors, restarts and iOS updates, gentle dry cleaning of the mic ports.
At a shop: a single confirmed dead mic (it's a soldered or flex-cable component, not user-swappable), anything following liquid exposure, and mic failure after a drop (a jarred flex cable needs opening the phone). At iFixForU, microphone and speaker repairs run $59–$89 depending on iPhone model, most are done in about 30 minutes, and every repair carries a 90-day warranty good at all nine of our stores. The diagnostic itself is free — we'll run the same three-mic isolation test with proper tools and tell you exactly which component failed before you spend anything.
Frequently Asked Questions
How much does it cost to fix an iPhone microphone?
Microphone/speaker repair at iFixForU is $59–$89 depending on model, with a free diagnostic first. If liquid corrosion is involved, water damage treatment is $99–$149. See the full breakdown in our iPhone speaker and microphone repair cost guide.
Callers can't hear me, but my voice memos are perfect. Why?
Both use the bottom mic, so the mic itself is likely fine. The usual suspects are a stuck Bluetooth route (your voice is going to paired earbuds), a carrier/VoLTE glitch (toggle Airplane Mode), or a specific app's noise-cancellation setting. Test with a regular phone call after turning Bluetooth off.
My mic got quiet and muffled gradually, not suddenly. What is that?
Gradual decline is almost always physical: lint packing into the mic port, or slow corrosion after old liquid exposure. Try the dry-brush cleaning first; if that doesn't restore it, the mic mesh or membrane needs professional attention.
Does Siri not hearing me mean the same problem?
Usually yes — "Hey Siri" relies on the same microphones. If Siri ignores you and your three-mic test showed a failure, it's one problem, not two. If Siri fails but recordings are fine, re-train Siri in Settings → Siri & Search.
Still Sounding Silent? Bring It In
Run the three-mic test, note which recording failed, and tell us the result — it genuinely speeds up your visit. Walk into our Monterey Park store or San Gabriel on Valley Blvd, or book online to skip the wait. Free diagnostic, about 30 minutes for most mic repairs, 90-day warranty, straight answers. Browse all repair services if anything else has been acting up.
