You’re on a call, talking normally, and the other person keeps saying “I can’t hear you.” Your voice assistant suddenly can’t understand a word. Videos you record sound distant and hollow. These are classic signs of a dying — or dead — phone microphone, and the frustrating part is that you can’t hear the problem yourself.

This guide walks you through a proper phone microphone test, step by step, so you can find out whether your mic is broken, blocked, or just being ignored by an app’s permissions.

Signs Your Microphone Might Be Failing

Before you start testing, it helps to know what mic trouble actually looks like:

• People can’t hear you on calls, but you hear them fine. (This is different from an earpiece speaker problem, where you can’t hear them.)
• Voice recordings and videos are silent, very quiet, or full of muffled distortion.
• Voice assistants (Siri, Google Assistant) don’t respond, or constantly mishear you.
• Speakerphone works but normal calls don’t — or the reverse. Phones have multiple microphones, so one can fail while another works fine.
• A specific app can’t record audio, but calls work normally — usually a permissions issue, not hardware.

If any of these sound familiar, run the tests below. They take about five minutes in total.

Test 1: The Voice Recorder Test (the most reliable)

This is the single best phone microphone test because it removes the phone network and apps from the equation.

1. Open your phone’s built-in voice recorder app — Voice Memos on iPhone, Recorder or similar on Android.
2. Hold the phone at normal distance, as if on a call.
3. Record yourself speaking normally for about ten seconds. Try a few different volumes.
4. Play it back and listen through headphones or the loudspeaker.

What you’re listening for: Your voice should be clear and at a normal volume. If it’s completely silent, whisper-quiet, distorted, or buried under crackling noise, the bottom microphone (the one used for calls) is likely blocked or damaged.

Test 2: The Speakerphone Swap Test

Modern phones have at least two microphones — one at the bottom for calls, another (often near the top or the camera) for speakerphone and video recording. If one fails, the other can still work, which is exactly how to isolate the fault.

1. Call your voicemail or a friend.
2. Start on a normal call and ask if they can hear you.
3. Now switch to speakerphone and ask again.

What this tells you: If they hear you fine on speakerphone but not on a normal call, your bottom microphone is the problem — the top one works. If neither works, it could be a software issue, a network problem, or both mics failing (less common, but possible after water damage).

Test 3: Video Recording Test

Open the camera app and record a short video while talking. Then play it back.

Phones usually record video audio through a different microphone than the call mic. If your voice memos are silent but videos sound fine, that confirms the fault is with the call microphone specifically, not the phone’s audio system as a whole.

Test 4: The App Permission Check

If your mic works in the voice recorder but not in WhatsApp, Zoom, Instagram, or dictation, it’s almost certainly a permissions problem.

• iPhone: Settings → Privacy & Security → Microphone. Make sure the app’s toggle is on.
• Android: Settings → Apps → [app name] → Permissions → Microphone → Allow.

Also check whether a “Hey Siri” or Google Assistant toggle got switched off after a software update — it happens more often than you’d think.

What to Do If Your Mic Is Blocked

Nine times out of ten, a “dead” mic is just a blocked one. The microphone hole at the bottom of your phone is tiny — about the size of a pinhead — and it fills up with pocket lint, dust, and grime over time.

1. Find the mic hole. On most phones it’s next to the charging port. Don’t confuse it with the SIM tray pinhole.
2. Brush it gently with a soft, dry toothbrush or a clean anti-static brush.
3. Never poke it with a needle or SIM ejector tool. You can puncture the membrane inside, and a punctured mic is permanently dead.
4. If the hole looks grimy, a small piece of blu-tack or adhesive putty pressed lightly over it can pull debris out without pushing anything in.

If the mic suddenly works after cleaning, that was your problem. Simple as that.

A Note on “Sound Cleaning” for Microphones

You may have seen our free speaker tool at FixMyPhoneSpeaker, which plays specific tones to push water out of a speaker. It’s worth being honest here: sound-based cleaning does not work on microphones. A microphone is an input device, not an output device — playing a tone through your speaker does nothing to a blocked mic hole. If someone is selling you a “mic cleaning sound,” save your time. The only fixes for a blocked mic are physical cleaning (as above) or repair.

Hardware vs Software: How to Tell

• Works in some apps but not others → software or permissions issue. Reinstall the app, check permissions, restart the phone.
• Dead in every app including voice recorder → hardware issue. Try cleaning the hole first, then consider a repair.
• Stopped working after water exposure → the mic membrane may be damaged. Let the phone dry fully for 24–48 hours before testing again. If it never comes back, it needs a shop repair.
• Stopped after a software update → software. Check for a follow-up patch, and try a restart before anything drastic.

A factory reset is sometimes suggested for mic problems, but treat it as a last resort — back everything up first, and only go there if you’ve ruled out blockage and permissions.

Frequently Asked Questions

How do I test my phone’s microphone without calling anyone?
Use the built-in voice recorder (Voice Memos on iPhone, Recorder on Android). Record ten seconds of normal speech and play it back — it’s the most reliable test because it doesn’t depend on network signal or another person.

Why can people hear me on speakerphone but not on a normal call?
Your phone has multiple microphones. Normal calls use the bottom mic, speakerphone uses a different one. If speakerphone works but normal calls don’t, the bottom microphone is blocked or damaged.

Can I clean my phone’s microphone with sound?
No. Microphones are input devices, so playing cleaning tones through your speaker won’t help them. Clean the mic hole gently with a soft brush or adhesive putty, and never poke anything sharp into it.

Why is my microphone not working in just one app?
That’s almost always a permissions issue, not a hardware fault. Check the app’s microphone permission in your phone’s settings and make sure it’s set to “Allow.” Try deleting and reinstalling the app if the toggle is already on.

Will a phone microphone dry out after getting wet?
Sometimes, yes — if water got into the mic hole, leaving the phone in open air for 24 to 48 hours can bring it back. Don’t use heat or a hair dryer. If it’s still dead after two days, the membrane is likely damaged and needs professional repair.

Should I do a factory reset to fix my mic?
Only as a last resort. A reset can fix stubborn software issues, but it wipes your phone, so back everything up first. Rule out blockage, permissions, and updates before going anywhere near that button.

A faulty microphone is annoying, but it’s one of the more diagnosable phone problems — five minutes of testing usually tells you exactly what’s wrong. If the tests show your speaker is the issue instead — muffled audio, no sound from videos — head over to FixMyPhoneSpeaker and run our free speaker cleaning tool. It plays targeted tones that push water and debris out of your phone’s speaker, and it takes less than a minute.