Why Xiaomi is resetting the call: causes and ways to eliminate

You're on the phone, and suddenly you're out of touch. Or worse, the caller hears your voice and you're not. Xiaomi smartphones (including the Redmi, POCO and Mi lines) often have the problem of spontaneously dropping calls, and the reasons for this can be either software failures or hardware failures. Unlike the "deaf" handsets or lack of network, when the problem is obvious, spontaneous cliffs are often a mystery: the grid is there, the signal is stable, but the conversation is interrupted at the 10th or 30th second.

In this article, we will discuss 7 key reasons why Xiaomi can drop calls – from banal (for example, conflict). SIM-We'll give you step-by-step solutions for each cause, including hidden settings. MIUI, We'll focus on models that support VoLTE and VoWiFi, where problems are often disguised as "poor coverage".

1. Conflict SIM-Why the two-sim phone calls are dropping

If your Xiaomi supports two of your SIM-And the problem with these cards is that they're not interacting properly, and most often, when they're interacting, they're interacting:

• 📶 One of them SIM run-in 2G/3G, second — 4G/5G (Different generations of networks conflict when switching).
• 🔄 The option "Switch data when calling" is active, but the network does not have time to intercept the call.
• 🚫 One of them SIM blocked by the operator (for example, due to debt), but the phone tries to route the call through it.

How to check: Go to Settings → SIM-maps and mobile networks → Settings SIM-and note the "Preferred network" item if for one SIM It's worth it. 4G, and — 3G/2G, This can cause breaks when switching between them during a call.

Make sure both SIMs are active (no carrier lock)

Select the same network mode for both SIMs (e.g. 4G/3G/2G)

Turn off the option "Switch data when you call"

Try calling using only one SIM (turn off the second)

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⚠️ Note: Some models (e.g. Redmi Note 10 Pro) POCO X3 Pro) when activating VoLTE on one SIM The second automatically moves into 2G. This can cause cliffs if the caller calls the "wrong" SIM. The solution is to manually prioritize the network for each card.

2. firmware problems: MIUI bugs and communication breaks

Software failures are one of the most common reasons for Xiaomi to drop calls, especially for devices with custom firmware or after failed updates.

• 🐞 Bug in the Telephony module (responsible for processing calls) after the update MIUI.
• 🔄 Conflict between the firmware version and the modem (for example, after a downgrade).
• 📱 Reset network settings after reset to factory settings (not all settings are automatically restored).

How to diagnose: If calls started dropping after the update, check the version of MIUI in Settings → About Phone. Compare it to the latest stable builds on Xiaomi's official website. For example, on Redmi 9T, cliff issues were massively recorded in MIUI 12.5.3, but fixed in 12.5.5.5.

Decisions:

1. Reset network settings: Settings → SIM-maps and mobile networks → Resetting network settings.
2. Update your firmware to the latest stable version (not beta!).
3. If the problem appears after the update, roll back via Fastboot (instruction below).

Radio module malfunctions: when the "iron" is to blame

If software methods fail, the problem may lie in the hardware, such as damage to a radio module (the chip responsible for communication).

• 📉 Calls are dropped even in the plane mode (if you turn it on after the conversation begins).
• 🔌 The phone overheats in the antenna area (upper body) during the call.
• 🔍 On the engineering menu (##4636##) signal level jumps from -80 dBm -120 dBm.

How to check:

1. Enter ##4636## and select Phone Information.
2. Look at the “Set preferred network type” line – if it is unavailable or resets after selection, it is a sign of a modem problem.
3. Try to call hands-free – if the cliffs continue, the radio module is to blame.

⚠️ Note: On models with MediaTek (e.g. Redmi Note) 10S or POCO M4 Pro) radio module malfunctions often only occur when the Internet is active. Try to turn off mobile data before calling - if the cliffs stop, the problem is in the Helio chip. G95/G96.

Only with an active mobile internet|Only one of them. SIM-map|After the phone falls/hits|After updating MIUI|I don't know, I haven't.-->

4. VoLTE and VoWiFi settings: why they interfere with calls

VoLTE (voice over 4G) and VoWiFi (wi-fi calls) are supposed to improve communication quality, but in practice they often cause cliffs, especially for:

• 🌍 Roaming (operators may incorrectly route VoLTE calls).
• 📶 Weak signal. 4G (The phone is trying to switch to 3G, but "hangs").
• 🔄 Two. SIM-Active VoLTE cards on both (priority conflict).

How to turn it off:

1. Go to Settings. → SIM-maps and mobile networks → [Choose. SIM] → Call over Wi-Fi/VolTE.
2. Turn off both settings and restart the phone.
3. Try calling - if the cliffs stopped, the problem was in these settings.

Critical information: On some models (such as Xiaomi 11T Pro), disabling VoLTE can result in a complete loss of the ability to call on 4G networks. This requires manual APN setup or network reset.

5. App conflict: who is stopping your calls

Some apps may block or interrupt calls because of:

• 🔒 Accessing microphone/dynamics (e.g. WhatsApp or Zoom captures audio).
• 📱 Battery optimization (applications like Greenify or MIUI Battery Saver is killing telephony processes).
• 🛡️ Antiviruses or VPN (For example, Kaspersky or NordVPN can filter voice traffic).

How to find the culprit:

1. Launch your phone in Safe Mode (press the power button → “Safe Mode”).
2. If in safe mode calls are not reset – the third-party application is to blame.
3. Turning to remove recently installed programs, starting with those that requested access to microphone or phone features.

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To check which app conflicts with calls, use the system event log. Enable it in Settings → About Phone → MIUI version (tap 7 times on the build number, then go back to Additional → Logs).

6.Problems with the operator: when it is not the phone that is to blame

Sometimes the cause of the breaks is not the phone, but the operator's side.

• 📡 Poor coverage in your area (especially relevant for VoLTE and 5G).
• 🔄 Technical work at the station (the operator may not inform about them in advance).
• 📞 Incorrect call routing (for example, if you use a virtual operator).

How to check:

1. Call from another phone (not Xiaomi) with the same phone SIM-If the cliffs repeat, the operator has a problem.
2. Check the coverage on your carrier’s card (e.g. RootMetrics).
3. Contact the operator support and request a log of your latest calls (they see the causes of the cliffs).

⚠️ Note: If you use eSIM, the problem may be incorrect profile activation.

Mechanical damage: antenna, speaker, microphone

Physical injuries are the most unpleasant cause, because they require repair.

• 📱 Cracks in the upper part of the body (there is an antenna).
• 🔊 Distorted sound in a speaker or microphone (may indicate contact oxidation).
• 💧 Corrosion traces under the lid SIM-tray (infestation of moisture).

How to diagnose:

1. Call hands-free – if the cliffs continue, the problem is not the dynamics.
2. Hold the phone to your ear and press the top of the body a little bit, and if the connection improves, it's the antenna.
3. Check the microphone: record the voice memo. If the sound is interrupted, the microphone is faulty.

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If the phone falls or gets wet, even a slight damage to the antenna track can cause calls to break, in which case only replacing the antenna module or the entire mother plume will help.

FAQ: Frequent questions about Xiaomi call dumping