Make a short recording, then compare it with a phone call or the affected app. That separates a microphone problem from permissions, Bluetooth routing or a network fault. Remove anything covering a microphone opening and use the model checks below before resetting the device.
Differential
Likely causes of “Samsung Galaxy S microphone does not work”, and how to tell them apart
- 1
A case with a port flap or narrow cutout
What separates it The voice is faint with the case on and normal without it
How to confirm Take the case off and check each of the three openings; test a call with the case off
- 2
A third-party dialer or call-blocking app
What separates it Callers cannot hear you on some calls and the Samsung dialer works
How to confirm Switch back to Samsung's Phone app as the default dialer and test again
- 3
Earbuds, a watch or a car holding the microphone
What separates it The call timer runs and the other person hears nothing
How to confirm Turn Bluetooth off and call again
- 4
Microphone permission switched off for one app
What separates it Only a video-call app or recorder is silent
How to confirm Settings, Apps, the app, Permissions, Microphone: Allow only while using the app
- 5
A failed microphone
What separates it The Samsung Members mic test fails with the case off and Bluetooth off
How to confirm Book a Samsung repair for the microphone
Before you touch a setting
Record this first — changing settings destroys the evidence
- Whether it fails on every call or on some, and in which app
- Whether the Samsung Phone app or a third-party dialer is the default
- The case on the phone and whether it has port covers
- The result of Samsung Members, Get help, Phone diagnostics, Mic test
Try in this order
0 of 6 completedTake the case off and call again
ReversibleRemove the case, especially one with port covers, and ask the other person whether you sound clearer.
Make Samsung's Phone app the default
ReversibleSettings, Apps, Choose default apps, Phone app, and pick Phone from Samsung; call-blocking apps that replace the dialer were the cure in several threads.
Switch Bluetooth off
ReversibleSwipe down and switch Bluetooth off so earbuds, a watch or a car do not hold the microphone.
Run the mic test
ReversibleSamsung Members, Get help, Phone diagnostics, Mic test; it exercises each microphone.
Record and compare
ReversibleRecord a Voice Recorder clip on the handset and on speaker phone; a faint clip on one points at one microphone.
Reset all settings if software is suspected
Reset / data riskSettings, General management, Reset, Reset all settings keeps your data and clears settings that can interfere.
Model-specific
What is true of this model and not of its siblings
- Samsung Galaxy S24 microphone is quiet, muffled or not working
- Samsung's community has a long record of S24 owners who find that callers cannot hear them, and the replies that mark a thread as solved fall into a short list. The case and its port covers come first, because the S24 has microphone openings at the bottom beside the USB-C port, at the top of the frame and on the back near the camera, and a case with a port flap or a narrow cutout covers one of them. Next is a third-party dialer or call-blocking app that took over the call audio: owners cured the fault by switching back to Samsung's own Phone app. Then Bluetooth, which grabs the microphone if earbuds or a car stereo are connected. If a test with the Samsung Members mic test still fails, the microphone needs service.
- A fault that comes and goes
- Owners describe a mic that fails on some calls and not others; that pattern points at software, the dialer or Bluetooth, not a failed microphone, which fails on every call.
- The call blocker trap
- Apps that screen calls can replace the dialer and route the call audio through their own service, so removing them is a quick test.
Stop boundary
When this stops being a self-service repair
- !If the mic test fails with no case and Bluetooth off, book a repair
- !If callers cannot hear you only on a call-blocking app's calls, the app is at fault
- !If the fault began with an update and others report it, send an error report with the call time
Evidence ledger
Sources behind this answer
Samsung's microphone checklist.
An S24 owner whose callers could not hear them, with the fixes tried.
Case, Bluetooth, dialer app and diagnostics checks.
Per-model battery, charging, chip, display, storage and update promise for the S24, S24+ and S24 Ultra.
Exact questions
Common questions
Why do callers sometimes hear me and sometimes not on my S24?+
Owners point to a third-party dialer or call-blocking app, a case covering an opening, and Bluetooth taking over; test with Samsung's Phone app, no case and Bluetooth off.
Where are the S24's microphones?+
At the bottom beside the USB-C port, at the top of the frame and on the back near the camera.
Does Reset all settings delete my data?+
No; it clears settings such as network and accessibility but keeps apps and files.
How do I test the S24 microphone?+
Samsung Members, Get help, Phone diagnostics, Mic test.
microphone: model differences
Also covered: Samsung Galaxy S20 Ultra family.