What does VoLTE mean in Xiaomi and how to activate the function

Xiaomi’s current MIUI or HyperOS smartphones offer users a variety of technologies to improve communication quality. One of the common but not always clear labels in the status bar is VoLTE. Device owners often wonder what the mode is for and whether it affects traffic consumption. It’s essentially a fourth-generation voice call technology that changes conversation quality.

When your Xiaomi Redmi or Poco displays an icon, it signals that the device is ready to work in an improved mode. Many users confuse this feature with video calls or Internet calls via instant messengers, but technically it is standard cellular communication, but using digital LTE channels. Understanding the principles of this technology will help you avoid communication problems in areas of uncertain reception.

In this article, we will explore what lies behind the term, how to activate the option on different models, and what to do if the icon does not appear. We will look at the technical nuances, the effect on the battery and how to force the activation of hidden engineer menus. A deep understanding of network settings will allow you to squeeze the maximum of the capabilities of your operator and smartphone.

Technical essence of the technology Voice over LTE

Voice over technology LTE It is a standard for transmitting voice traffic over networks. 4G. Unlike the old standards. 2G and 3G, where voice was transmitted through dedicated voice channels, and the Internet via batch, a single voice is used here. IP-This allows the phone to stay in mode. 3G or 2G This means that, for the user, the Internet continues to work at the maximum speed available on the network during the conversation. LTE.

The main advantage is the speed of the connection: when dialing in 2G/3G networks, it takes a few seconds before the beeps until the network finds a free channel. In VoLTE mode, the connection is established almost instantly. In addition, the sound quality improves significantly: it becomes cleaner, background noise disappears, and the frequency range expands (HD Voice technology), this is especially important for business negotiations or conversations in noisy places.

It is worth noting that the function requires support from the telecom operator. In Russia, major operators such as MTS, Beeline, MegaFon and Tele2 have long implemented this technology. However, even if the operator supports the standard, your tariff plan should provide this option. It is usually turned on by default on modern tariffs, but in some old archival plans may require connection through the operator's application.

⚠️ Note: Using VoLTE may slightly increase battery consumption, as the communication module operates in a more active signal search mode. LTE, However, the difference in modern Xiaomi models is almost invisible.

It's important to distinguish between normal data and voice packets, and voice data in this mode is a high priority in the operator's network, which ensures that even when the cell tower is loading hard, your conversation will not be interrupted and the sound quality will not fall, and the connection stability in this mode is much higher than with classical voice calls.

How to enable VoLTE on Xiaomi smartphones

Activation of the feature on Xiaomi devices usually occurs automatically if the device is not activated. SIM-The card and the operator support the technology, but in some cases manual intervention is required. The first step should always be to check the settings in the standard menu. → SIM-maps and mobile networks. Here you need to select a specific SIM card for which you want to set up a connection.

In the menu that opens, find “Use VoLTE” or “Enable VoLTE.” If the switch is present and active, your phone is fully compatible and the operator has provided the necessary profiles. Once you turn on the status bar, the appropriate icon should appear. If the slider is missing or inactive, this may mean that the operator has not identified the phone model as supported, or the necessary settings are hidden in the firmware.

There is also an engineering menu available through the dialing code. Dial ##4636## in the Phone app. From the menu that opens, select Phone Information. You can find advanced radio settings here. Find "VoLTE Provisioned" and activate it. After that, the phone may need to reboot to apply changes. This method does not work on all versions of MIUI, since Xiaomi often hides access to the engineering menu in global firmware.

• 📱 Open the standard “Settings” app on your desktop.
• 📡 Go to section «SIM-maps and mobile networks».
• 🔘 Select the desired SIM card and find the “Use VoLTE” switch».
• 🔄 If you can’t find the option, try entering the ##4636### code in the dialer.

In some cases, network resets help. This won't delete your personal data, but will return all connection settings to factory values. The way to this feature is: Settings → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth. Once reset, the phone will re-register in the operator's network and can get up-to-date setting profiles.

Why VoLTE doesn’t work: The main reasons

The lack of the desired icon or the inability to activate the feature is often puzzling for owners of Xiaomi Mi and Redmi Note. The most common reason lies in the tariff plan. Telecom operators sometimes block this feature at old or cheap rates to stimulate the transition to more expensive lines.

The second important factor is the firmware version and the region of the device. Chinese versions of smartphones, flashed to the global version, can have conflicts in the configuration files of the network. Operators use special lists of allowed devices (whitelist). If your device is not on the list, the operator does not send a command to activate VoLTE. In such cases, it helps to edit system files or use special activator applications, although this requires certain technical skills.

And you also have to consider the physical location. Even if you have 4G, the nearest tower may not support voice over LTE. In these situations, the phone will automatically switch to 3G for voice calls, and the VoLTE icon will disappear. This is normal system behavior, aimed at ensuring continuity of communication. The coverage area plays a crucial role in the stability of the technology.

⚠️ Warning: If you have reflashed your phone from the Chinese version to the global version, check if the bootloader is unlocked. In some cases, locking the bootloader interferes with the proper operation of the network modules after the change of region.

Another reason could be the use of two SIM cards. On many Xiaomi models, when VoLTE is activated on one SIM card, the second can go into 2G/3G mode or become unavailable for voice calls if the phone does not support DSDS (Dual SIM Dual Standby) technology in full for LTE networks. In the settings, you can try to disable the second SIM card to check the operation of the first one.

Technology comparison: VoLTE vs 3G and Wi-Fi Calling

To better understand the benefits of the new technology, it is useful to compare it with its predecessors and alternatives. Classic 3G (UMTS/HSPA) provides normal sound quality, but requires switching channels when you go online. Wi-Fi Calling allows you to call where there is no cellular signal, but depends on the quality of the Wi-Fi router. VoLTE combines the advantages of high quality and mobility.

Below is a table showing the key differences between voice technologies:

Particular attention should be paid to the transition to 5G. Fifth-generation networks use VoNR (Voice over New Radio) technology, which is a logical extension of VoLTE. 5G VoLTE remains the main standard of high-quality communication. Xiaomi 13, Xiaomi 14 and newer smartphones are already fully ready for work in networks 5G, But in the current reality rely on LTE.

Wi-Fi Calling is good in thick-walled rooms where the cellular signal doesn't pass, but Wi-Fi catches perfectly. However, VoLTE is preferable outside and on the move, because it doesn't require searching and reconnecting to access points. The ideal bundle is when both options are available, and the phone itself switches between them without breaking the connection, which modern flagships of Xiaomi can do.

Impact on traffic consumption and battery

One of the most common questions is about pricing, because voice is transmitted over the Internet protocol, many fear that minutes will be subtracted from the Internet traffic package. LTE Operators clearly separate data packets and packets of minutes, even if the transmission is technically through a transmission. IP-The traffic is not consumed.

On the one hand, constant search for 4G networks and high-frequency operations can consume more power than 2G standby mode. On the other hand, fast connection and efficient audio coding allow you to complete a conversation faster, which saves resources. On today’s Qualcomm and MediaTek processors used by Xiaomi, the difference in autonomy is minimal and often invisible in everyday use.

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If you are in a very weak 4G signal zone, the phone will constantly try to stay on the LTE network, which will quickly land the battery, in such cases, it is better to temporarily switch the network to 3G Only or 2G/3G in the settings.

There's a myth that VoLTE eats gigabytes. It's not. The amount of data that's sent to encode voice is negligible compared to watching video or loading pages. Even if it were charged as traffic, the cost of a minute of talking would be a penny. Operators would be more profitable to transfer people to VoLTE, because it offloads old 2G/3G frequencies that can be used for other purposes or disabled.

Solving Activation Problems Through Engineering Menu

If standard methods didn't work, you can try a deeper level of customization, which requires access to an engineering menu. I'll remind you of the code: ##4636##. If the menu doesn't open, your version of the MIUI shell may be blocking that access, so you can try installing the Activity Launcher app from Google Play and find the activity of the IMS Service or Testing to get into the settings you want.

Inside the engineering menu, find the section related to telephony (Phone Information). Scroll down to "Set Preferred Network Type «LTE» (for example, LTE/TD-SCDMA/GSM). The next checkbox is "VoLTE Provisioned." Check the box. If the icon appears after that, but disappears after the reboot, you may need to fix the settings through the box. ADB-This is the level of the advanced user.

There is also a method of editing the system file. carrier_list.xml, But it requires root rights and knowledge of file structure. MIUI. This is only suitable for enthusiasts who are willing to risk the device's warranty. In most cases, just make sure that the access point settings are in place (APN) The correct operator profile is selected. APN before the factory settings does wonders.

Remember that software bugs in MIUI itself can temporarily disable the feature. Keep an eye out for system updates. Xiaomi engineers regularly release patches to improve carrier compatibility. If the problem occurs after the update, try clearing the cache of the Phone and Google Play apps.

Frequently Asked Questions (FAQ)

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VoLTE on Xiaomi is a communication quality standard that should be activated by each user for comfortable calls and stable Internet during a conversation.