Modern mobile standards require not only high data rates, but also impeccable voice quality. Voice over LTE allows high-resolution voice (HD Voice) directly over a fourth-generation network without switching to 3G or 2G during a conversation. For owners of Xiaomi, Redmi and POCO smartphones, activation of this feature is often a key factor in the comfort of using a device in the networks of operators of the Big Three and virtual MVNOs.
However, despite the widespread adoption of the standard, many users are faced with a situation where the VoLTE icon does not appear in the status bar, and voice calls reset the network to 3G or H+. This can be caused by both software limitations of the MIUI or HyperOS firmware, and the lack of operator-side configuration. In this article, we will discuss in detail all possible activation methods, including hidden engineering menus and manual editing of configuration files.
It is worth noting that the process of inclusion can vary dramatically depending on the region for which the smartphone is released and the version of the operating system. Global versions of firmware often have limitations that are not in Chinese builds, which requires the use of specific methods of bypassing. Understanding the architecture of the modem in Xiaomi devices will help you avoid typical errors and successfully configure high-quality communication.
Verification of the operator's compatibility and conditions
Before you go to the complex manipulation of system files, you need to make sure that your equipment is compatible with the operator’s infrastructure. SIM-The cards support voice transmission through LTE First of all, contact your mobile operator’s personal account or call support to check if VoLTE is connected on your number.
It is often the case that even with operator support, the function is not available in the smartphone settings, because the Xiaomi firmware database may not have a profile of your operator or region, in which case the system blocks the display of the corresponding switch, considering the configuration incompatible.
It is also important to check the physical condition. SIM-Older cards issued by more 5-7 years ago, you may not support the necessary security and encryption protocols required to run on networks. 4G/LTE It's a voice-transmitting thing. SIM-The first and easiest step in the cabin of the operator is the first and often solves the problem.
- 📱 Make sure that your reception area is stable. 4G/LTE.
- 💳 Check that SIM-The card is under 5 years old and supports the standard USIM.
- 🌐 Check with the operator whether VoLTE works in your region and at your tariff.
⚠️ Note: Even if the screen displays an icon 4G, This does not guarantee the operation of VoLTE. The network can only be used for data transmission, and the voice will be transferred to the Internet. 3G.
Basic activation through system settings
Standard way to include the function in current versions of the HyperOS shell and fresh builds MIUI If your operator is officially cooperating with the manufacturer, the switch should be available in the standard settings menu. SIM-maps and mobile networks.
Select the SIM card you want to activate the feature for, and find Use VoLTE. In some localizations, it may be called LTE Calls or 4G Calls. Activation of the toggle should cause the corresponding indicator to appear at the top of the screen. If there is no such item, try switching the network type to LTE mode Preferably.
Sometimes the system requires a reboot after changing the network settings. Once the switch is turned on, complete the full cycle of turning off and on the smartphone, this is necessary in order for the modem to re-register in the operator's network with updated profile parameters.
☑️ Checking basic settings
Some models allow you to use high-speed voice simultaneously on both SIM cards (Dual VoLTE), while others support it on only one active line.
Use of engineering menus and hidden codes
If a standard switch is not available, the hidden capabilities of the Android operating system come to the rescue. The engineering menu allows you to access deep modem settings that are hidden from the average user. For Xiaomi devices, the most effective is the use of special code to log into the test menu.
Open the Phone app and dial ##4636##. If the code is entered correctly, the Testing menu will open. Select Phone Information. In this section, you will need to find the Set Preferred Network Type setting.
Recommended mode: LTE Only or LTE/TD-SCDMA/WCDMAThere's also a VoLTE Provisioned or Turn on VoLTE switch, and if it's turned off, activate it. However, it's not enough to just turn it on, because you often need to change the network type to the same one. LTE Only for compulsory registration on the network 4G, Then you can return the standard mode. LTE/WCDMA/GSM. This action “awakens” the VoLTE profile in the modem.
⚠️ Note: Change of network type to LTE Only can cause incoming calls to be lost if VoLTE is not permanently activated as the phone will stop seeing networks. 2G/3G. Be careful!
Note that newer versions of Android (11, 12, 13, 14 and above) often block access to this menu through codes for security reasons. If the code does not work or the menu is empty, you will need to use third-party apps or root-enabled methods, which will be discussed below.
What if the code doesn't work?
Application of activation applications
When embedded system tools are not available, users turn to specialized software. The most popular and time-tested tool is the VoLTE Enabler application or its counterparts, such as 4G LTE Switcher. These utilities use system APIs to change hidden configuration flags.
For the operation of such applications, superuser rights (Root) are often required, but many of them are able to work through the Internet. ADB (After installing the application, you need to start the activation process by selecting your operator from the list. MCC (Mobile Country Code and MNC (Mobile Network Code).
The activation process through third-party software usually takes a few seconds. Once the settings are successfully applied, the phone can automatically restart the radio module. If an HD or VoLTE icon appears, then the profile is successfully recorded in the device memory. In some cases, manual entry of the operator code, which can be found in open databases or forums, is required.
- 📥 Download the verified activator application from a reliable source.
- 🔒 Provide the necessary permits or rights Root/ADB.
- 📡 Select your operator and press the activation button.
- 🔄 Reboot your smartphone to apply changes.
It's important to understand that third-party software always carries minimal risks, and while these applications don't interfere with critical system files in the kernel, they change the configuration of the radio module, and if you don't work properly, you can always reset the network settings to factory settings.
Activation through ADB-team without Root rights
For advanced users who do not want root rights, but the standard engineering menu is not available, there is a method of activation through debugging. USB. This is a safe way, because it doesn't change the system partition, it just changes the global settings of the Android database, USB-cable and installed platform ADB.
First step, turn on Settings → About Phone → Press 7 times on the MIUI version to activate Developer Mode. Then in the advanced settings, turn on USB Debugging. Connect your phone to your PC and open the command prompt in the ADB folder.
To enable VoLTE, you must enter the following command:
adb shell settings put global volte_enabled 1A command may also be required to force the inclusion of:
adb shell settings put global carrier_volte_available 1Once the commands are in place, it is recommended to restart the device, which works on most modern Xiaomi, Redmi and POCO models, but its effectiveness depends on the Android version and the operator’s policy. If the command is successful but there is no effect, it is possible that the operator blocks the service at the network level for devices without a certified profile.
💡
Use the adb device command before entering the settings to make sure the computer sees your device and the debugging permission is confirmed on the smartphone screen.
Table of operator codes for manual setting
In some cases, activator applications require manual input of network parameters. Below is a table with the main codes of operators in Russia and CIS countries, which are most often required for manual registration of a VoLTE profile in configuration files or applications.
| Operator. | Country. | MCC | MNC | Note |
|---|---|---|---|---|
| MTS (MTS) | Russia | 250 | 01 | Requires a tariff with VoLTE |
| Beeline (Beeline) | Russia | 250 | 99 | Often requires a profile update |
| Megafon (MegaFon) | Russia | 250 | 02 | Support at most tariffs |
| Tele2 | Russia | 250 | 20 | Uses a network of partners |
| Kcell / Activ | Kazakhstan | 401 | 01 | Depends on the region. |
These codes are unique cellular identifiers. MCC represents the country code, and MNC represents the operator's code. When manually configured through engineering utilities, erroneously entering these values can cause the phone to stop seeing the network at all, so double-check the data.
Addressing common problems
Even after successful activation, users may experience unstable function, such as a VoLTE icon, but calls are still reset to 3G. This often indicates that at a particular location, the 4G network is too weak to transmit voice, and the phone automatically switches to a more stable, albeit slow, standard.
Another common problem is that the icon disappears after the reboot, which may indicate a conflict of program profiles, in which case it is recommended to delete the current operator profile in the settings. SIM-maps and add it again, or reset the network settings (Settings) → Connection and sharing → Reset Wi-Fi, mobile networks and Bluetooth).
⚠️ Attention: Network settings reset will delete all stored Wi-Fi passwords and associated Bluetooth devices.
If nothing helps, it’s possible that your smartphone model doesn’t physically support the LTE (Band) frequencies required for your carrier’s VoLTE to work in your area. Check the modem specifications on the GSMArena website and compare them to the carrier’s frequencies.
💡
If VoLTE does not work after all the manipulations, the problem may be on the operator’s side or in the lack of support for your model in this region.