Modern Xiaomi smartphones running MIUI shells or the new HyperOS have the widest range of features for high-quality voice communication. One of the key technologies for crystal clear sound and instant connection is Voice over LTE. Many users often wonder whether this feature is active on their device, as visual indicators can be hidden or work incorrectly due to operator settings.
Verifying VoLTE status is not only necessary for the sake of the status bar icon, but also to understand how your call is made. If the technology is not active, when the phone is in or out calling, it can force the phone to switch to outdated 2G or 3G networks, which leads to breaks and drops in Internet speed during a conversation. In this article, we will discuss in detail all the ways to diagnose and force the service on Xiaomi devices.
It’s worth noting that the absence of a visible VoLTE or HD icon doesn’t always mean that the technology doesn’t work. Telecom operators and smartphone makers often hide this indicator to minimize visual noise, relying on automatic mode switching, so relying not only on the icon, but also on the actual behavior of the device during the connection.
Basic indicators and visual verification
The first and most obvious way to know if LTE voice technology is active is to look at your Xiaomi status bar. However, there are some nuances that depend on the firmware version and regional settings. In the standard scenario, when everything is set up correctly, a small HD icon or VoLTE should appear next to the 4G or LTE network division.
If you don't see these designations, it's not a cause for panic. MIUI The display icon is disabled by default by the developers, in such cases, you need to pay attention to the behavior of the network at the time of the call. 4G/LTE h+, 3G or E, which means that voice traffic is transmitted through LTE-channel.
💡
Note the antenna icon: If the Internet continues to work at high speed during the call and does not fall into 3G, VoLTE technology is likely active, even without the corresponding icon.
It's important to distinguish between simply having a fourth-generation network and supporting voice calls through it. LTE provides fast internet, but without an activated VoLTE protocol, the phone will still reset the connection to 3G for voice calls. Visual validation is just the first stage of diagnosis that testing should follow.
- 📶 Badge HD or VoLTE in the status bar – a direct indicator of activity.
- 📱 No switching to 3G/H+ During the call – an indirect sign of work.
- 🌐 Simultaneous operation of fast Internet and voice communication is a key marker of technology.
Checking through the engineering menu and hidden settings
For a deeper diagnosis, Xiaomi owners can use a hidden engineering menu, a powerful tool that allows you to see the real state of communication modules hidden from the average user. To get there, open the Phone app and dial the combination ##4636#. If the menu opens, select Phone Information.
Inside this menu, find the section related to network settings. There may be a VoLTE Provisioned switch or similar setting. If the switch is active (checked or in the ON position), then the phone is technically ready to work with voice over LTE. However, changing these settings requires caution, since incorrect settings can lead to loss of communication.
What if the code doesn't work?
Remember, the engineering menu shows the capabilities of the smartphone itself, but it doesn't guarantee that the service is connected on the operator's side. Even if the Xiaomi menu is green, without the appropriate tariff, the provider will not establish communication, so this method is good for checking hardware and firmware, but not the status of the service.
☑️ Diagnostics through the Engineering Menu
Testing the quality of communication and network behavior
The most reliable way, which does not require special knowledge or root rights, is practical testing, which requires a test call and a careful monitoring of the behavior of network indicators, and in ideal conditions, when VoLTE is working, the Internet connection speed during the conversation remains the maximum, corresponding to the 4G standard.
Try to enable high-resolution video playback or run a speed test right at the time of a call. If you download fast and no buffering, and the network icon remains 4G or LTE, the technology is active. If the video stops and the icon changes to H+ or 3G, then you switch to packet switching of old networks, and VoLTE is not working at the moment.
⚠️ Warning: When testing, make sure you are in a confident signal reception zone LTE. In a weak signal, the phone can be forced to switch to 3G To ensure the stability of voice communication, even if VoLTE is enabled.
Also worth paying attention to is the speed of connection. Voice over LTE provides an almost instantaneous buzzer after you press the call button. If you hear long beeps before a connection, it may indicate that the phone is first trying to find a 4G network, does not find a stable channel for voice, and switches to 2G/3G, which takes time.
- ⏱️ Instant connection (1-2 seconds before the beeps - a sign of VoLTE.
- 📉 Stable Internet speed during a conversation confirms the work LTE.
- 🔄 No jumping of the network icon (4G ↔ 3G) — test.
Set up network settings in the Xiaomi menu
If the check showed that the function is not active, you need to make sure that the settings of the smartphone are correct. In Xiaomi devices, the control of this option may be in different places depending on the version. MIUI. The standard path looks like this: Settings → SIM-maps and mobile networks → Choice SIM-map → Use VoLTE.
If you don't have one, try changing the region of your phone. Often, for some regions (like India or Russia), the function is turned on by default and hidden, while for others (Europe) it needs to be activated manually or it is not available due to certification. Change the region in the menu Additional → Region can unlock the desired options.
💡
Changing the region to India or Russia in the phone settings often forcefully activates hidden VoLTE menus for all inserted devices. SIM-map.
In some cases, you may need to reset your network settings. This won't delete your personal data, but will return all modem settings to factory values. You can do this through the Settings menu → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth. After the restart, the phone will again request settings from the operator, which can correct the registration error in the IMS network.
The influence of the operator and SIM-VoLTE work cards
Even a perfectly tuned Xiaomi will not be able to work with voice through the phone. LTE, unless supported by your communications provider or a specific SIM-The service must be connected to the data plan. Some operators have it active by default, others require sending. USSD-request or connection through a personal application.
It also matters your age and type. SIM-Old cards issued 5-7 years ago, the security and authentication protocols required for the IMS (IP Multimedia Subsystem: This will require replacement SIM-card for a new one in the operator’s cabin, while maintaining its number.
| Operator. | Connection status | Action required |
|---|---|---|
| MTS | Automatically. | Enable VoLTE in your phone settings |
| MegaFon | Automatically. | Check the tariff and network settings |
| Beeline | On request. | USSD command or application |
| Tele2 | Automatically. | Replace SIM with USIM (if old) |
It’s important to consider that support for the technology depends on the specific base station you’re connected to. In remote areas or buildings with thick walls, LTE coverage can be unstable, forcing the phone to switch to 3G to provide voice services even if the service is paid for and configured.
Resolving Errors and Connection Problems
A common problem for Xiaomi owners is the disappearance of the VoLTE icon after a firmware update or change. SIM-In this case, manual restarting of the radio module service helps. 10-15 It's going to make the phone re-register and request a profile. IMS operator.
If you use two of them SIM-maps, make sure that the settings are the right scenario. MIUI When using two cards, one of them can be forced to switch to the mode 2G/3G to receive a call if the second one is busy transmitting data. → SIM-Maps and mobile networks to make sure priority is given 4G both-card.
⚠️ Note: Using modified firmware or root rights may disrupt the security certificates required for VoLTE.
In extreme cases, if nothing helps, you can try manually prescribing APN settings, although this is rarely required for VoLTE. The main attention should be paid to the APN type field, which should indicate default, supl,mms and, in some cases, ims. However, it is better to consult with your operator's technical support before making changes.