Why Xiaomi phone is hard to hear the interlocutor: a full analysis of the causes and solutions

You call for an important business, but the voice of the interlocutor sounds like a barrel, interrupted or disappears? The problem of “poorly heard in the handset” on Xiaomi smartphones is one of the most common complaints of users. According to service centers, every 5th owner of the brand’s devices faces it, regardless of the model: whether it is a budget Redmi Note 12 or the flagship Xiaomi 14 Ultra. 60% of cases are to blame for software failures, 30% – hardware malfunctions, and only 10% are due to external factors like a bad signal.

In this article, we'll not just list the possible causes, but we'll look at them from a technical point of view: how the soundtrack works in Xiaomi, what components are responsible for voice transmission, and why even a new phone can "muffle" the interlocutor. You'll learn how to diagnose a problem in 2 minutes, what settings to check first, and when it's time to bring the device to the service. And also - reveal the secret engineering code for testing microphones, which even the official instructions are silent.

Mik Problems: Why Your Partner Can't Hear (or Hear You Badly)

If the person complains that your voice is interrupted, sounds quiet or with interference, the microphone is most likely to be to blame. In Xiaomi smartphones, there are usually two of them: the main one (bottom of the case, next to the charging connector) and the noise suppression one (at the top, next to the speaker). If one of them fails, the phone automatically switches to the second one, but the quality of communication decreases.

How to check microphones without special equipment:

• 🔍 Visual inspection: Take a flashlight and look at the microphone holes, and if they're clogged with dust or dirt, the sound will be muted. 9/10 — Their microphones are located in the depressions, where garbage easily gets into.
• 🎤 Record test: Open the Dictator app, record 10 seconds of speech, and listen. If the voice sounds like a barrel or a bang, the microphone is faulty.
• 📱 Engineering menu: enter the code ##4636##, select Phone Information» → «Speak to the microphone - if the band is unresponsive or shows a low signal level, the problem is confirmed.

A common cause of microphone failure is oxidation of contacts after moisture hits. Even if the phone does not sink, condensation from extreme temperature changes (for example, when you walk from the cold into a warm room) can cause corrosion. In Xiaomi services, this problem is eliminated by ultrasonic cleaning, but compressed air (for example, a canister to clean the keyboard) can temporarily help.

⚠️ Warning: Never use cotton swabs or toothpicks to clean your microphones! This can damage the microphone membrane or push dirt deeper.

2.Contaminated speaker: why you can't hear the interlocutor

If you don't hear voices in the tube, and not the other person, the problem is the conversational speaker. In Xiaomi, it's located at the top of the screen (near the front camera), and it's often clogged with dust, potassium fat deposits, or cosmetic residues. AMOLED-screens (e.g. Xiaomi) 13T) The speaker is hidden under a grid that is difficult to clean indiscriminately.

How to Clean Your Speaker Safely:

1. Turn off the phone and take off the case.
2. Take a soft toothbrush (new!) and gently walk around the speaker grid in circular motions.
3. Use sticky tape to clean the cameras (sold in photo stores) - it will pull out small particles of dust.
4. For final cleaning, use a can of compressed air (keep at a distance of 10 cm so as not to damage the membrane).

If the sound has not improved after cleaning, the problem may be damage to the speaker membrane, which often occurs after falls or severe vibrations (for example, if the phone was lying next to the speaker at full volume), in which case the speaker should be replaced - it is impossible to repair it.

Turn off the phone and remove it. SIM-map|

Use only soft materials (brush, sticky tape)|

Do not use liquids or alcohol solutions |

Blow air at a distance of 10+ centimeter-->

3. Software failures: When MIUI firmware is to blame

MIUI is known for its features, but sometimes they work against the user, for example, in versions of MIUI 13-14, there was a common error: after the update, the noise reduction settings were reset, which made the voice of the interlocutor sound like cotton, and also problems with sound can cause:

• 🤖 Google Phone Conflict: If You Use Google’s Standard Phone App Instead of Your Home App MIUI Dialer, there may be delays in sound.
• 🔄 Resetting audio settings: After updating, the "Sound during a call" profile is sometimes reset. → Sound. → Sound quality when calling.
• 🚫 Applications blocking the microphone: Some programs (such as Truecaller or WhatsApp) may conflict with system services.

How to fix software failures:

1. Restart your phone in Safe Mode (press the power button → Safe Mode) If the sound is normalized, the third-party app is to blame.
2. Reset network settings: Settings → SIM-maps and mobile networks → Resetting network settings.
3. Update your firmware to the latest version or roll back to stable if the problem appears after the update.

In extreme cases, resetting to factory settings will help, but save data before that! 80% of software problems are solved by flashing through the Mi Flash Tool, but this requires unlocking the bootloader.

4 Network problems: when the operator is to blame, not the phone

If the problem with sound only manifests itself in certain places (for example, in the subway or on the outskirts of the city), the fault is bad network signal. Xiaomi has a feature: when the signal is weak, the phone automatically switches to 2G to save battery, and in this mode the sound quality is worse than in 4G VoLTE.

How to check and correct:

1. Look at the network indicator in the status bar. If E or 3G is on, you're in a bad zone.
2. Enable VoLTE (voice through) 4G): Settings → SIM-maps and mobile networks → [Yours. SIM] → Enable VoLTE.
3. If VoLTE is not available, try manually selecting the network: → SIM-map → Choice of network → Manual search.

Sometimes the problem lies in the incorrect settings. APN. For example, if you use a virtual operator (like Tinkoff Mobile or Yota), the settings may get lost. → SIM-map → Access points (APN) Compare this with your official data.

⚠️ Warning: If the audio is completely lost after manual selection of the network, return the settings to Automode. In some regions (for example, in Crimea), manual selection can lead to complete loss of communication.

5. Hardware malfunctions: when without service can not do

If all the software methods have been tried and the problem remains, it is likely the hardware that is to blame.

• 🔌 Oxidation of contacts of the sound chip: occurs after moisture is injected. Symptoms: sound disappears when the phone is tilted or after heating.
• 🔊 Damage to the sound codec: Qualcomm chip WCD93xx (It is sensitive to overheating. If the phone overheats frequently, the codec may fail.
• 📶 Antenna module malfunction: In metal-body models (e.g. Xiaomi Mi 11), antennas can move away from the board after falls.

How to diagnose a hardware problem:

1. Connect headphones - if they sound normal, and the speaker is not in the dynamics, the speaker or his plume is to blame.
2. Call via WhatsApp or Telegram – if the sound is clear, the problem is in the cell phone module.
3. Check the phone on the vibrator table (available in service centers) - if the sound disappears when vibrating, this is a sign of cold soldering.

The cost of repair in official Xiaomi services:

• Microphone Replacement: 1,200–2,500 ₽.
• Replacement of the Speaker: 1,500–3,000 ₽.
• Sound chip repair: 3,000–6,000 ₽ (model-wise).
• Replacement of antenna module: 2,000–4,500 ₽.

💡

If the phone is warranty, don't open it yourself! Xiaomi has hidden seals that go off when the case is disassembled.

External factors: covers, humidity and electromagnetic interference

Sometimes the sound problem isn't the phone.

• 📱 Metal covers: They shield the signal, especially if they cover the top of the phone (where the antenna is located).
• 💧 Humidity: Even if the phone hasn’t sunk, high humidity (such as in the bathroom or kitchen) can cause condensation inside the case.
• 📡 Electromagnetic interference: near microwaves, refrigerators or powerful speakers, communication can deteriorate.
• 🔋 Battery discharge: At a charge level below 15%, the phone automatically reduces the signal transmission power.

How to minimize the impact of external factors:

• Use plastic or silicone cases without metal inserts.
• Avoid talking in places with high humidity or temperature changes.
• If the connection goes missing at home, check Wi-Fi Calling (includes in Settings). → SIM-map → Wi-Fi Calling).

💡

If the problem with sound only manifests itself in a specific place (such as at work or at home), external factors are to blame, not the phone.

7 Hidden MIUI settings: how to improve sound in calls

MIUI has hidden features that can improve sound quality, such as the engineering menu, which can turn off noise cancellation, which sometimes works too aggressively, or turn up the microphone volume.

How to get into the engineering menu and what to set up:

1. Enter the code ##4636## → select “Phone Information”.
2. Scroll down to the "Set audio parameters" block.
3. In the Type field, select Sph (microphone), in Level, set the value from 200 to 255 (usually 128).
4. Press Set, then restart the phone.

Also in MIUI function HD-calls that improve sound quality but only work with supported operators (e.g. MegaFon or MTS:

1. Open the Settings. → SIM-maps and mobile networks.
2. Choose yours. SIM-map → «HD-call-up» → turn on the option.

If the sound has become worse after the changes, return the settings to factory values!

Frequent Questions (FAQ)