The Internet is off at Xiaomi during a call: the reasons and how to fix

The problem of Xiaomi losing the Internet during a phone call is one of the most common complaints of users of the brand: you call, and mobile data suddenly turns off: pages don't load, notifications stop coming, messengers freeze. In some cases, the Internet does not recover even after the call is completed, and you have to reboot your smartphone. Why is this happening and how to fix it?

In this article, we will look at all possible causes, from basic settings to hardware malfunctions, how to check VoLTE mode, what network parameters affect connection stability, and when the problem lies in firmware or hardware, and also what Xiaomi models most often encounter this problem and how to avoid it when buying a new device.

Now, let's just say, the problem isn't always with the smartphone itself, and sometimes it's the carrier's fault, especially if you're using virtual carriers (Tinkoff Mobile, Yota, Tele2) or in a region with unstable coverage, but 80 percent of the time, the solution is on the surface, just change a couple of settings.

1. VoLTE is the main culprit of the problem

VoLTE (Voice over LTE) technology allows you to call over a 4G network without “switching” to 2G/3G. In theory, this should improve the quality of communication, but in practice, many Xiaomi users are faced with the fact that when VoLTE is activated, the Internet disappears during a conversation. Why?

The fact that some operators (especially in Russia) have not fully optimized the work of VoLTE with Xiaomi devices. 4G-And you can hear the other person, but the Internet goes down because of protocol errors.

How to check if VoLTE is enabled on your Xiaomi:

1. Open the Settings. → SIM-maps and mobile networks.
2. Choose yours. SIM-map.
3. Find the VoLTE or VoLTE call option (in some firmwares, Improved Calls).
4. If the switch is active, turn it off and restart the smartphone.

If VoLTE is turned off, the Internet is working during calls, the problem is solved, but consider: voice quality may slightly deteriorate, since calls will go over 3G/2G. If VoLTE was disabled initially, then we move on to the following reasons.

2. Incorrect settings of the mobile network

Even if VoLTE is disabled, the problem may lie in other parameters of the mobile network, for example, a smartphone can automatically switch to 2G when calling, which leads to a break in the Internet, or vice versa, try to hold on to 4G despite a weak signal.

What to check first:

• 📶 Network Mode: Open Settings → SIM-maps and mobile networks → Network type. Make sure it's selected. 4G (preferably 3G/4G (If only the car is worth it. 2G — The internet will be shut down on any call.
• 🔄 Automatic network selection: Check in the same menu to see if Automatic Network Selection is enabled. If not, turn it on so that your smartphone can select the best communication standard for itself.
• 📡 Data roaming: if you are roaming, some operators block the Internet during calls. Check the roaming settings in the Mobile Network section.

Pay special attention to the access point (APN). Sometimes after a firmware update or change SIM-mapping APN They're being reset, which causes the Internet to be unstable. APN:

1. Go to Settings. → SIM-maps and mobile networks → Access points (APN).
2. Click on the three dots in the top right corner and select Reset to default values.
3. Reboot your smartphone.

Select 4G mode (preferably)

Enable automatic network selection

Check the APN settings

Turn off VoLTE (if enabled)

Reboot the smartphone after the changes-->

3. Problems with firmware and updates

Firmware bugs are one of the most insidious reasons, such as the Xiaomi Redmi Note 10 Pro and POCO X3 Pro, where a common bug was found when the Internet disappeared on any calls after upgrading to MIUI 13, even if VoLTE was disabled, and the manufacturer fixed this only in the next patch.

How to know if the fault is firmware:

• 🔄 The problem arose immediately after the update.
• 📱 Forums (4PDA, Mi Community: Other users complain about the same model and version MIUI.
• 🛠️ Resetting settings to factory does not help.

What to do:

1. Check out the current version of MIUI: Settings → About Phone → MIUI version.
2. Go to the official MIUI Downloads website and find your model.
3. If a newer version is available, update via Settings → System Update.
4. If there are no updates, but the problem is relevant, try to roll back to the previous version (instruction below).

For firmware rollback:

⚠️ Attention: Firmware rollback with Fastboot or Recovery can result in a bootloader lock if you haven't unlocked it beforehand.On models with a locked bootloader (e.g. Xiaomi) 12T Or the Redmi Note 11 Pro.+ 5G) This will make the smartphone inoperable!

• Download the desired version of MIUI from the Xiaomi Firmware Updater website.
• Rename the file to update.zip and place it in the root of the phone’s memory.
• Press Volume Up + Power to enter Recovery.
• Select Install update.zip and confirm the installation.

Hardware malfunctions: communication module and antenna

If the software methods didn't work, the problem could be the hardware, and the most common ones are:

• 📡 Damaged antenna – if the smartphone fell or was exposed to moisture, the antenna contacts could oxidize.
• 🔌 Faulty communication module – responsible for the work SIM-If it breaks, the Internet can disappear not only during calls, but also in normal mode.
• 🔋 Worn-out battery – at low voltage, a smartphone can “save” energy by turning off mobile data during load (call).

How to diagnose a hardware problem:

1. Try inserting. SIM-If the problem persists, it is the operator's fault or SIM.
2. Check if the Internet is lost when calling via Wi-Fi Calling (if supported); if not, a problem on the mobile network.
3. Run the antenna test using the engineering menu: ##4636## Go to Phone Information and look at the network signal. If they change constantly or show 0, the antenna is faulty.

If you suspect a hardware breakdown, contact the service center. On models Xiaomi Redmi Note 9 Pro and POCO F3 often found the dump antenna contact — it can be soldered for 500-1000 rubles.

5. Conflict with applications and energy saving

Sometimes the Internet is shut down due to third-party applications or aggressive power saving settings.

• 🔋 Power Saving Mode Can Block Mobile Data During Calls to ‘Save’ Charge.
• 🛡️ VPN Firewalls (such as NetGuard or AdGuard) may interfere with telephone services.
• 📱 Battery optimizers (such as Greenify or built-in) MIUI) Sometimes the system processes responsible for the network are frozen.

How to check:

1. Turn off the power saving mode: Settings → Battery → Energy saving mode → Off..
2. Go to Settings → Apps → Permissions → Auto Run and make sure that system applications (e.g. Phone, Google Play Services) have permission enabled.
3. Temporarily turn off VPNs and firewalls, then check if the Internet disappears when you call.

If the problem is gone, one of the apps is to blame. To find the culprit, try turning off programs that run in the background (antiviruses, optimizers, call messengers).

💡

If you use Dual Apps, try disabling this feature, and sometimes cloned apps conflict with the main system services, leading to a breakdown of the Internet.

6.Problems on the part of the operator

It's not always the smartphone's fault, and carriers can be a problem, too, especially if:

• 📡 You use a virtual operator (Tinkoff, Yota, SberMobile) that rents networks from the "big three" (MTS, Beeline, MegaFon). 4G They may work unstablely.
• 🌍 You're roaming or you're in a coverage area, and some operators will prioritize voice over data in these conditions.
• 🔄 On the operator side, technical work is carried out or equipment is updated.

How to check:

1. Call your carrier’s hotline and check if there are any VoLTE or 4G issues in your area.
2. Try inserting. SIM-card of another operator (for example, instead of Tinkoff - MTS.
3. Check the coverage on your carrier’s map (e.g., MTS coverage map) and there may be a weak 4G signal in your location.

If the operator has confirmed the problem on his side, then we just have to wait for the fixes.

• Disable VoLTE (as described above).
• Manually select 3G network in the settings (sacrificing Internet speed).
• Use Wi-Fi Calling if your tariff and smartphone support it.

💡

If the problem occurs after a change in operator or tariff, 90% of the time the ISP-side settings are to blame. SIM-map.

7 Xiaomi models most prone to the problem

Some Xiaomi models suffer from Internet disruptions more often than others, due to their hardware platform or raw firmware, and here is a list of the most problematic devices:

If your model is on this list, try the table solutions first. If not, follow the general instructions in the previous sections.

Also note the year of your smartphone. Xiaomi devices 2018-2019 (e.g. Redmi Note 7, Mi 9) often have an issue with the wear of the antenna module. Newer models (2020-2023) usually have the firmware or operator settings to blame.

What do you do if nothing helps?

If you have tried all the ways, but the Internet is still lost when calling, there are radical measures:

• 🔄 Reset to factory settings (don’t forget to make a backup!).
• 🛠️ Fastboot flashing (only for experienced users!).
• 📱 Replacement SIM-New cards (sometimes old ones) SIM incompatible with modern standards).
• 🔧 Contact the service center (if you suspect a hardware malfunction).

Before resetting your settings, try another way to turn on the plane mode for 30 seconds, then turn it off, which sometimes helps to "reset" the communication module without fully restarting the smartphone.

If you decide to do a reset:

⚠️ Note: On Xiaomi models with a locked bootloader (most devices purchased in Russia), a factory reset may result in a requirement to enter a password from your Mi Account if you haven't tied it! Make sure you remember your login and password, or untie your account in advance in Settings → Xiaomi account.

Resetting instructions:

1. Make a backup of the data through Settings → Additional → Backup and Reset.
2. Go to Settings → About the phone → Reset settings.
3. Select Reset all settings (does not delete files) or Delete all data (complete reset).
4. Confirm the action and wait for the reboot.

Once reset, reset your smartphone, but don't reset from the backup, which can bring back the problem. Install the apps manually and check if the internet goes missing when you call.

FAQ: Frequent questions