How to turn on VoLTE on Xiaomi phone: the complete guide

Modern smartphones Xiaomi and Redmi provide users with a wide range of opportunities for high-quality voice communication, but by default the voice function over the network. LTE Many device owners face a situation where during a conversation the phone switches to the phone. 3G or 2G, This leads to a deterioration in the sound quality and the inability to use the mobile Internet at the same time. LTE The system is designed to solve this problem by providing voice as a data stream in the fourth generation network.

Activation of this option allows you to enjoy crystal clear sound and instant connection to the subscriber, but the process of setting is not always obvious to the average user. In some regions or in certain carriers, the necessary parameters are not automatically prescribed, requiring manual intervention in the system. HD-calls on Chinese brand devices, from simple menu settings to using hidden engineering codes.

Before you start changing system settings, make sure your hardware and SIM card are technically supportive of fourth-generation voice networks. Lack of carrier support or a plan will make any manipulation of your phone settings useless. So the first step should always be to check your fare and network coverage conditions in your place of residence.

What is VoLTE and why is it necessary?

Voice over LTE is a standard for voice traffic over LTE networks, allowing the same channel for calls as for mobile Internet. Unlike traditional calls that use channel switching (CSFB), VoLTE transmits voice in the form of data packets, similar to messages in instant messengers, but with priority for low latency, which allows you to simultaneously talk and actively use the navigator or stream music without falling to 3G speed.

The main advantage of using HD Voice is a significantly higher sound quality, which covers a wider frequency range of the human voice. Interviewers hear each other more clearly, background noise disappears, and the time for establishing a connection is reduced to 1-2 seconds. For users of Xiaomi smartphones, this is especially true, since many models have excellent multimedia capabilities that are fully revealed only with high-quality communication.

⚠️ Note: VoLTE usage consumes mobile internet traffic, but most operators do not charge this traffic, including it in a packet of minutes.

In addition, the technology allows video calls directly through a standard “bell ringer” without installing additional applications, if this function is supported by the operator. Connection stability in places with uncertain reception is also increasing, since LTE networks often have better coverage than outdated 2G and 3G standards. Understanding the principles of this technology helps the user to correctly configure his gadget for maximum efficiency.

Checking the compatibility of the operator and the tariff

Before you go into deep system settings, it is critical to make sure your carrier provides VoLTE services in your area. HD-The SIM card is not registered on the network or the tariff plan does not imply this option. Most major federal operators have already implemented this technology, but in some remote areas coverage may not be available.

Often, to activate the service, you need to send a special USSD-request or connect the option through the operator's personal application. Without this step, the phone can see the network 4G/LTE, But if you try to call, you'll still reset the connection to 3G. Check the balance and status of connected services, as sometimes the VoLTE feature is only available on certain tariff lines or requires a basic package of minutes.

• 📱 Make sure it's inserted into the phone. SIM-standard-card USIM (It's usually all modern cards with cutouts).
• 📡 Check the network coverage 4G/LTE in your area through the operator card or the presence of the appropriate icon in the status bar.
• 💳 Contact the operator’s technical support or visit the communication salon to confirm VoLTE support on your number.
• 📲 Install the official operator app to quickly check the connection status of the service HD-call-up.

Also, consider that some virtual operators (MVNOs) may not support this technology while running on the infrastructure of other networks. In such cases, turning on the phone-side feature will not work. If the operator confirms support, and the VoLTE or HD icon does not appear, then proceed to the settings of the device itself.

Standard activation via MIUI settings

In most modern shells MIUI And the HyperOS VoLTE switch is located in the visible part of the settings menu, but users often overlook it. To access the basic settings, you need to open the Settings app and go to the Settings section «SIM-Maps and mobile networks. Here you select a specific SIM card that requires high-speed voice activation.

Once you select a SIM card, find "Use VoLTE" or "Enable VoLTE" and activate the slider. If this switch is missing, your firmware version may be hiding it for a given region or operator, in which case the system relies on automatic detection, but manually starting often solves the problem of malfunction.

Sometimes, after switching on, you need to restart the device so that the changes take effect and the phone re-registers on the network with the updated settings. If after the reboot, the HD or VoLTE icon appears in the status bar, then the procedure was successful. Otherwise, if the switch is not present or it is inactive, you will need to use more advanced configuration methods.

Use of the Engineering Menu to Activate

If a standard switch is not available, the most effective way is to log into the engineering menu through a special code. This method allows you to access hidden modem settings where you can force support for Voice over LTE. To do this, open the Phone application and type the combination ##86583#. In response, the system should output the message "VoLTE Carrier check was disabled" or similar, which means unlocking the hidden menu.

Once you have successfully entered the code, go back to the SIM card settings where the previously hidden VoLTE switch should now appear. If the code didn't work or the message didn't appear, try the alternative code ##4636##, which opens the common test menu, and select Phone Information and find the item responsible for installing the preferred network type.

⚠️ Note: Do not change unknown parameters in the engineering menu, except those related to VoLTE. Careless change of the radio module settings can lead to signal loss or unstable operation of the phone.

From menu 4636, find the drop-down list “Configure preferred network type” and select an option that contains LTE and TD-SCDMA or GSM, for example, “LTE Only” (test only) or “LTE/TD-SCDMA/WCDMA.” Be careful: choosing “LTE Only” mode can make incoming calls impossible if VoLTE is not yet configured, so after checking, be sure to return the standard mode.

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If the code 86583 does not work, try to enter the code of your country or region, for example, for Russia, operators specific codes sometimes work, but the basic code MIUI is universal for unlocking menus.

Setup via Xiaomi EU app and hidden menus

For advanced users who own smartphones with an unlocked bootloader or global firmware, there is the option of customizing through the hidden Cit menu or specialized applications. One popular solution is using the Xiaomi app. EU or similar utilities that allow you to edit system configuration files of the network. ADB-team.

If you use a computer, you can connect the phone in debugging mode. USB and enter a command to change the global parameter: adb shell settings put global volte_enabled 1. This command forcibly activates the VoLTE support flag in the Android system. After completing the command, you need to restart the device.

adb shell settings put global volte_enabled 1


adb shell settings put global volte_feature_enabled 1




adb shell settings put global carrier_volte_available 1

This is especially true for models imported from China, where European frequencies or features are software blocked. It is important to understand that when you update the firmware, these settings may reset and you will have to repeat the procedure.

• 💻 To work with ADB You need to install Xiaomi drivers USB Driver on the computer.
• 🔓 Debugging mode by USB It is included in the About Phone menu (7 clicks according to version) MIUI) -> «Advanced settings» -> «For developers».
• 🛡️ Antivirus on PC can block the work ADB, temporarily shut it down when performing commands.

Solving problems and lack of HD icon

Even after all the manipulations, the HD or VoLTE icon may not appear in the status bar, although the function actually works. This is a common situation for some operators who do not transmit the signal to display the icon, or for Xiaomi custom firmware. To check whether the technology works, call someone and run an Internet speed test at the same time; if the speed does not fall to 3G/2G, then VoLTE is active.

Sometimes the problem lies in the outdated version of the baseline (Baseband) or the firmware itself, in which case it helps to update the software to the latest available version through the About Phone menu. If you use global firmware on a Chinese device, you may need to flash it to the version for your region or install Xiaomi.eu, where these features are unlocked by default.

⚠️ Warning: Flashing your phone or installing custom recaps may result in a loss of warranty.All actions with the software you perform at your own risk and risk.

It’s also worth checking if you have an energy-saving theme installed or a system modification that blocks the modem’s background processes to save charge. Returning to standard design and resetting network settings (Settings -> Connection and Sharing -> Reset Wi-Fi, mobile networks and Bluetooth) often helps to resolve software conflicts.

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The absence of an HD icon does not always mean that VoLTE does not work, but the main criterion for checking is the simultaneous operation of high-speed Internet and voice calls.

Frequently Asked Questions (FAQ)