When a sound is lost during an incoming or outgoing call, it can be taken by surprise at the most inopportune moment. Smartphone owners Xiaomi, Redmi and Poco often face this, not realizing whether the cause is a software failure or a physical breakdown. The lack of audio makes it impossible to communicate fully, turning a modern gadget into a useless piece of plastic.
The causes of the problem can range from a corny sound switched off to serious errors in the operation of MIUI system services. Often users accidentally activate the Do Not Disturb mode or lock the speaker with a case without noticing it. In more complex cases, recent firmware updates or conflicting third-party applications are the culprits.
In this detailed guide, we will take a look at all possible scenarios and offer effective solutions, and you will learn how to diagnose a malfunction, perform proper calibration, and adjust hidden system settings for sound quality.
Basic diagnostics and physical switch verification
Before you go into complex settings, you need to rule out basic errors. Often the lack of sound is dictated by simple actions that the user may have taken randomly in his pocket or bag. Check the position of the volume slider during the incoming call, it may have been reduced to a minimum.
Notice the protective case. Some accessories have too thick sides that cover the opening of the speaker at the top of the screen. Take off the case and check if the sound is coming out. Also make sure that the speaker's grid is not covered by dust or pile.
- 🔊 Press the volume button during the call and make sure the scale is not at zero.
- 📵 Check if the “Silent” or “Do Not Disturb” mode is activated in the notification curtain.
- 🎧 Turn off Bluetooth completely so that the sound is not transmitted to the earphones or speakers that are forgotten in the bag.
- 🧹 Clean the top end of the smartphone from contamination with a soft dry brush.
If after these manipulations the situation has not changed, it is worth moving to a deeper analysis of the software part of the device.
📊 Have you ever encountered a missing sound on Xiaomi?
Yes, after the update.
Yeah, after the fall.
No, I'm working.
It's quiet, but there's
Android, which is operated by the MIUI or HyperOS shell, has features designed to help people with hearing impairments, but accidentally activating them can cause the average user to stop hearing.
One of these features is Monophonic Sound or Hearing Improvement, which if these options are not enabled correctly, can suppress certain frequencies or redirect the audio stream, and it’s also worth checking the noise reduction settings, which sometimes work too aggressively by eating the voice of the other person.
To access these options, go to Settings → Sound and Vibration → Sound Customization. You can find additional options that affect voice quality. In some firmware versions, these items are hidden in the Special Opportunities section.
⚠️ Attention: Enabling Hearing Improvement may cause voice distortion and extraneous noises. Use this mode only when necessary.
Hidden engineering codes
Some regions have codes to log in to the engineering menu, such as ##6484## or ##4636##. This can run the speaker test, but be careful: changing unknown parameters can disrupt network operation.> Software reset and reboot services If the phone is physically OK, there is a possibility of a temporary failure in the system process responsible for telephone communication. Android System process or Google Play services could freeze, blocking the transfer of audio data. The easiest and most effective way is to completely reboot the device.This will clear the RAM and restart the services if you are physically OK, you can temporarily supload all the system process, try to reboot all the phone for 10-15 seconds. ☑️ Checklist of software reboot Turn off the phone and turn on through 10 Seconds Check for system updates Clear the cache of the "Phone" application Reset network settings to factory: 0 / 4 A more radical but safe method is to reset your network settings, which will not delete your personal photos or contacts, but will return your Wi-Fi, Bluetooth and mobile settings to factory values. → Connection and sharing → Reset Wi-Fi, cellular networks and Bluetooth. Diagnostics through the engineering menu For advanced users and professionals, there is the possibility of checking the hardware through the engineering menu CIT. This tool allows you to test every component of your smartphone in isolation, including the top and bottom speakers, microphones and proximity sensors. To get into the testing menu, open the Phone app and type in the code ##6484##. If the code didn't work, go to Settings → About Phone → Version of the kernel (click 5-7 times). In the menu that opens, select "Receiver" or "Speaker" to check. Component of the test Function Normal result Receiver Check of the top speaker Clean sound, heard the squeak of Silence or strong hiss Speaker Check of the lower speaker Loud music or the melody Whip, crack or no sound from the sound of the test, the error of the parties is not possible to restore the error with the operating system when the voice is closed. New version MIUI It can contain bugs that developers fix in subsequent patches, and it can cause a conflict with applications for recording calls or smart number detectors, try to start the phone in safe mode, in this mode only system applications load. If you have a sound in Safe Mode, it means that one of the apps you installed is to blame. ⚠️ Warning: Third-party memory cleaners ("cleaners") often aggressively terminate system processes, which can cause the sound driver to fail when a call is made. If the problem appears after the update, wait for a new patch to come out or consider rolling back the previous firmware version via your computer. When software methods are exhausted and tests in the engineering menu show an error, it is "hardware." In Xiaomi smartphones, the talk speaker is a separate module that can fail over time due to moisture, dust or natural wear. A frequent cause of quiet sound or lack of it is the oxidation of the contacts of the speaker plume. This often happens after the device hits a high humidity environment or after a slight water hit. In this case, professional cleaning with ultrasound helps. It is also worth checking the main charging connector plume, as the speaker can be integrated in the lower communication. 💡If the engineer test speaker is wheezing or crackling, it's a must-replace -- further operation can damage the audio chip on the motherboard. In cases where the phone fell, the speaker plume connector could move away. Careful disassembly and reconnection of the plume sometimes solve the problem instantly. But without experience, it's best not to take risks, so as not to damage fragile components (FAQ) Why is the sound only gone on WhatsApp and Viber, and the normal calls are working? This indicates a microphone problem or a software conflict of a particular application. Check the permissions for messengers in the privacy settings. Also try to clear the app cache or reinstall it. Can you increase the volume above the standard on Xiaomi? Yes, with third-party equalizer apps or through the engineering menu (Audio item). But over-volume software can physically break the speaker's membrane, so be careful. What if the speaker doesn't hear me? The problem is the microphone. Check if it's covered with a cover. Wipe the microphone holes (usually two at the bottom and top). If it doesn't, run the microphone test in the engineering menu. Does the sound sound on the phone ringing screen affect the safety film on the screen? Yes, if the film closes the talking speaker's grid or the proximity sensor. Thick hydrogel or glass films can lower the volume and try to make the sound sound sound sound.