The situation when during an important conversation the interlocutor stops hearing you can take you by surprise at the most inopportune moment. If your device Android microphone does not work, this may be caused by either a software glitch or physical hardware damage. Before panicking and taking the gadget to a service center, it is worth carrying out a number of independent checks, which often help to restore the functionality of the sound recording.
In most cases, the problem lies in the incorrect operation of the operating system or a conflict in applications that block access to audio devices. Software errors occur much more often than the failure of the module itself. We will look at a step-by-step algorithm of actions that will allow you to localize the problem and, probably, fix it without extra costs.
Sometimes the reason for silence is a banal blocking of the speaker hole with a cover or contamination that is easy to remove. However, if the matter is deeper, you will need care and consistency in your actions. Let's look at the main causes and ways to eliminate them.
Primary diagnosis and external factors
The first thing you need to do if the microphone on your phone does not work is to eliminate external interference. Take a close look at the bottom of the case, where the main microphone hole is usually located. Often, protective films applied inaccurately or thick covers block access to sound. Even a layer of dust or lint in your pocket can significantly reduce the sensitivity of the sensor.
Try removing the case and wiping the microphone area with a soft, dry cloth. If you are using a headset, turn it off and check the sound through the device itself. There are times when Bluetooth device remains connected in the background and the phone tries to transmit sound through it rather than through the built-in module.
⚠️ Warning: Do not use sharp objects, needles or high-pressure compressed air to clean the microphone hole. You risk damaging the membrane or pushing dirt even deeper into the case.
It is also worth checking if the Do Not Disturb or Airplane mode is activated, although the latter usually blocks the communication itself. Sometimes third-party call recording or noise reduction apps can take over audio control. Try temporarily uninstalling or disabling such apps to check their impact on the system.
app settings and access rights
If there are physical obstacles excluded, let's move on to the software part. The operating system Android strictly controls application access to the microphone. If you notice that the sound is missing only in a certain messenger (for example Viber or Telegram) or application, the problem may be a lack of appropriate permissions.
To check the settings, go to the menu Settings → Applications. Find the problematic application in the list and select “Permissions”. Make sure the switch next to Microphone is activated. In new versions of Android, access may be limited only for the duration of use or completely prohibited.
In addition, it is worth checking the global sound settings. Sometimes users accidentally lower the microphone volume or activate noise canceling features that don't work properly. In the engineering menu or accessibility settings you can find parameters that affect sensitivity.
Use a voice recorder to check. Record a voice message and listen to it. If there is sound in the voice recorder, but not in calls, the problem is precisely in the settings of a specific application or network.
There is also the possibility of a software version conflict. If you recently updated your system or installed a major security update, a bug may have occurred. In this case, it is useful to check for new patches that developers often release to correct such errors.
Resetting settings and rebooting the system
One of the most effective ways to deal with software glitches is to simply reboot the device. Many users ignore this step, but it helps to clear RAM and terminate hung processes that could be blocked by audio drivers.
If a normal reboot does not help, try a deeper clearing of the system cache. This will not delete your personal data, but it will reset temporary files that may have become corrupted. To do this, go to Settings → System → Reset settings (the path may differ depending on the model, for example, Samsung or Xiaomi).
☑️ Checklist before resetting
It is important to understand the difference between resetting application settings and completely resetting the phone (Hard Reset). A full wipe will return the device to its factory state, removing all photos, contacts and apps. You should resort to this method only as a last resort, when other methods have been exhausted.
⚠️ Attention: Before performing a hard reset, be sure to create a backup copy of all important data. After this procedure, it will be impossible to restore information without a backup.
Using the engineering menu for testing
In devices based on Android hidden is a special engineering menu designed for diagnosing hardware components. With its help, you can check whether the microphone physically works, without installing third-party software. The login code may differ depending on the processor and manufacturer.
Open the “Phone” application (dialer) and enter one of the following codes: ##3646633## (for MediaTek processors), #0# (for Samsung) or ##4636## (universal for many models). If the code is accepted, the service menu will open.
In the menu, find the section Hardware Testing or Audio. A microphone test will be available there (usually indicated as Microphone or Normal Mode). Click the "Start" or "Test" button and say something. If the volume level is displayed on the screen or you can hear yourself in the headphones, the (hardware) is working properly.
| Manufacturer | Enter code | Menu section | What we are checking |
|---|---|---|---|
| Universal | ##4636## |
Phone information / Test | General diagnostics |
| Samsung | #0# |
Receiver / Mic | Speaker and microphone |
| MediaTek (Xiaomi, Lenovo) | ##3646633## |
Hardware Testing → Audio | Full audio test |
| Sony | ##7378423## |
Service tests → Audio | Sound test |
Code not working?
If none of the codes work, try searching Google for “engineering menu + your phone model.” For some brands (for example, Huawei or Honor), access to this menu may be closed by the manufacturer or require special rights.
Physical damage and hardware problems
When software methods are powerless, most likely the problem lies in the hardware. If the phone has recently been dropped, wet, or exposed to extreme heat, the microphone cable may have come off or the contacts have oxidized. In modern smartphones, the microphone is often soldered into the board or connected by a thin cable, which is easily damaged by an impact.
Symptoms of hardware failure are usually obvious: wheezing, crackling, complete absence of sound, or the appearance of static noise. Also, the microphone may work intermittently if the contact pad on the board has oxidized. In such cases, cleaning the board with ultrasound or resoldering the module can solve the problem, but this requires soldering skills.
Another reason may be the failure of the audio codec - the chip responsible for processing sound. In this case, not only the microphone, but also the speaker may stop working, or the sound will be distorted in all applications. Repair in this case is complicated and requires replacing a component on the board.
If the microphone test in the engineering menu shows no signal (level 0 or -inf dB), and reboots do not help, this is a direct sign of a hardware malfunction.
Do not forget about moisture penetration. Even if the phone is protected according to the standard IP67 or IP68, over time the tightness is broken. Moisture causes contact corrosion, leading to gradual component failure. If the phone gets wet, you cannot dry it with a hairdryer - this drives the water deeper.
When you need to contact service
There are a number of situations when independent repairs can lead to permanent breakdown of the device. If you do not have experience disassembling smartphones, it is better not to open the case, especially if the device is under warranty. Opening the seals automatically voids the manufacturer's warranty.
Contacting professionals is necessary if:
- 📱 The phone fell from a height or was stepped on.
- 💧 Liquid (water, coffee, rain) got inside the device.
- 🔋 The device got very hot before the microphone failed.
- 🔊 There is a strong static noise or squeaking during a conversation.
The service center will conduct diagnostics using an oscilloscope and a multimeter, pinpoint the faulty unit and replace it. The use of original spare parts guarantees that the sound quality and noise reduction will remain at the factory level.
⚠️ Attention: If your smartphone is under warranty, any independent repair (opening the case, peeling off the rear window) will result in a refusal of free service. First, contact an authorized center.
Frequently asked questions (FAQ)
Why does the microphone work in the voice recorder, but cannot be heard in WhatsApp?
Most likely, the problem is in the permission settings for a specific application. Go to Settings → Applications → WhatsApp → Permissions and make sure that access to the microphone is allowed. Also try clearing the application cache.
Can a virus block the microphone on Android?
Yes, malware can intercept control of audio devices or block their operation. Conduct a full scan of your device with an antivirus (for example, Google Play Protect or a third-party solution) and remove recently installed suspicious applications.
What to do if the sound is lost after updating Android?
The update could cause a system file conflict. Try resetting your network settings (Settings → System → Reset settings → Reset Wi-Fi, mobile data and Bluetooth). If this does not help, you may need a complete data reset (Hard Reset).
How to check if the microphone is working without calls?
Use the built-in Voice Recorder app or launch the camera and record a short video while speaking into your phone. If there is sound on the recording, then the hardware is working properly, and the problem should be looked for in the communication or operator settings.
Will cleaning with a toothbrush help if the microphone is clogged?
Careful cleaning with a soft toothbrush can help if the hole is clogged with dust. However, be careful not to damage the mesh. It is better to use a special adhesive tape or a soft brush.