Modern Xiaomi and Redmi smartphones offer users a wide range of advanced mobile technologies, among which VoLTE is a special feature. Many owners notice this icon in the status bar next to the network indicator, but not everyone fully understands its practical value and impact on the quality of communication. In fact, it is a fourth-generation voice technology that radically changes the experience of using the phone.
In the past, when a device is forced to switch to 2G or 3G standards, which often led to interruption of the Internet connection. With the advent of 4G LTE, this has changed, allowing you to talk in parallel with active use of data. In this article, we will discuss in detail how this technology works in the ecosystem of MIUI and HyperOS, and help you to customize it correctly for your device.
Technological foundations and principle of VoLTE operation
VoLTE stands for Voice over. LTE, Which literally means "Voice through" LTE». Traditionally, networks. LTE It was designed exclusively for high-speed packet data, whereas voice was based on circuit switching in older generation networks. IP-packets and transmit it over the same channel as Internet traffic, bypassing the need to switch the radio module.
To do this, Xiaomi smartphones use a software module integrated into the firmware and support from the operator’s base stations. The sound quality of HD Voice (high-quality sound) is much superior to standard frequency ranges, transmitting a wider range of human frequencies, which makes the interlocutor’s speech more natural and legible, even in conditions of noise.
One of the key features is the connection speed. Call setting time is reduced to 1-2 seconds, whereas in older networks the wait for beeps could take up to 10 seconds. However, it is worth considering that for stable operation it requires a confident 4G signal. If network coverage is weak, the phone will automatically return to 3G, and the icon in the status bar will disappear.
- 📡 Voice transmission occurs as data without taking up a separate voice channel.
- 🔊 High-resolution codec support provides crystal clear sound without distortion.
- ⚡ Instant connection with the subscriber thanks to optimized alarm protocols.
- 🌐 Simultaneous operation of high-speed Internet and voice call without switching.
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The main advantage of the technology is the ability not to interrupt the download of files or navigation during a conversation, which is critical for active users.
Benefits of activating the function for the user
The inclusion of this feature on Redmi devices offers tangible benefits in everyday use, primarily in terms of audio quality. Standard voice calls often cut high and low frequencies, making voice “telephone” and flat. HD Voice technology extends this range to allow you to hear the intonation and breathing of the interlocutor, which is especially important in business negotiations or conversations with loved ones.
The second important aspect is energy efficiency: since the phone does not have to constantly switch between the modes of operation of the radio module (from 4G to 3G and back), the battery consumption is reduced. The modem chip operates in a more stable mode, without expending additional energy to re-register on a different network standard after the call is completed.
⚠️ Attention: The quality of the communication depends on the coverage of your carrier's network, unless there is a stable signal in your receiving area. 4G, activation of the function will not give a result, and in some cases can lead to frequent resets of calls.
Also worth noting is the convenience for gamers and those who are constantly online: you can play the game in real time, watch a video stream or download large files, and the call will not interrupt this process. The Internet will continue to work at full speed, which is impossible in third-generation networks without CSFB technology.
- 🔋 Reduced energy consumption due to the lack of constant reconnection between networks.
- 🎮 No connection breaks in online games and apps during incoming call.
- 🗣️ Improved audibility of the interlocutor even in places with background noise due to noise reduction.
Verification of support SIM-card-and-operator
Before looking for settings in the smartphone menu, make sure your mobile operator provides VoLTE service in your region.The largest Russian and foreign carriers have long implemented this technology, but it may not be activated on the default tariff plan or require the connection of an additional option.
Besides, she herself. SIM-If you use a card that was issued many years ago, it may not support the necessary security and data protocols, and you will need to replace the plastic in the communication room, which is usually done free of charge while maintaining the number.
You can use the service status check USSD-Often you need to send a special request to activate the function on the network side, without confirmation from the operator, the phone settings will not be available or will not work correctly.
The table below gives examples of commands for activating a service from popular operators (teams can change, check the relevance):
| Operator. | Activation command | Check-in team | Default status |
|---|---|---|---|
| MTS | *111*3117# | *111*3117*2# | Connected. |
| Megaphone | *155*0055# | *155*0055*2# | Activation required |
| Beeline | *110*1951# | *110*1951*2# | Connected. |
| Tele2 | *155*61# | *155*61*1# | Automatically. |
How to enable VoLTE in Xiaomi and Redmi settings
Current versions of MIUI and HyperOS make activation as easy as possible. Usually, the switch is in the main settings menu of the mobile network. However, in some regions or on certain versions of the firmware, this item may be hidden if the system has not determined support by the operator.
To enable, go to the Settings section, then select SIM-Maps and mobile networks, and then you need to tap on the right one. SIM-map (if there are two) and find the switch Use VoLTE. If the switch is active but the icon in the status bar does not appear, try restarting the device.
☑️ Algorithm for function inclusion
Sometimes the system requires additional confirmation, a pop-up may appear warning about possible traffic charging, and don’t worry: voice traffic within VoLTE packets is not usually consumed from the bulk of the Internet, but is charged like normal minutes, but is technically transmitted through a data channel.
⚠️ Note: Some global firmware versions may not have a menu item, which may require a region change in your phone settings (e.g. India or Singapore) where support for the feature is more advanced, but do so with caution.
Hidden Engineering Menus and Forced Activation
If standard methods fail to enable the feature, you can use the Android engineering menu, which is an advanced way to control the parameters of the radio module directly. To enter the test menu on Xiaomi smartphones, the code # #86583## is often used, which forcibly includes hidden operator checks.
Once you enter the code, you may see a short-term notification, “VoLTE carrier check was disabled” (or enabled), which means you have removed the software restriction that the switch was hiding in the settings, then go back to the normal network settings menu, where the missing switch should appear.
##86583##Another method involves using a SetEdit application or similar system database editors, but this requires root rights or use of the same. ADB-For the average user, entering code into a ringer is the safest and most effective method.
What if the code doesn't work?
It is important to understand that interference with the radio module can lead to unstable reception of the signal in rare cases. If after activation through the engineering menu, you start to have problems with communication, it is better to reset the network settings to factory values.
Diagnostics of problems and lack of icon in the line
It is common to have a feature enabled in the settings, but not having the corresponding VoLTE or HD icon at the top of the screen.This does not always mean an error. In newer versions of Android and MIUI, the icon can be hidden by the interface developers to minimize visual noise, while the technology continues to work.
To check if the function is actually working, call someone and run an internet speed test or file download at the same time. If the speed does not drop to 3G/2G and the 4G/LTE indicator does not change to H+ or E, then everything is functioning correctly.
If the connection is broken or the Internet is blocked, check the following factors:
- 📱 Make sure that the network mode is selected in the settings Preferably 4G (LTE).
- 📡 Check if flight mode or power saving is enabled to limit modem operation.
- 💾 Make sure the operator has coverage. LTE in your current location right now.
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For accurate real-time diagnosis of the type of connection, install a Cell Info Lite application that will show you which network (LTE, WCDMA, GSM) your phone is on at a given second.
It can also be a problem between the two. SIM-On some Redmi models, full VoLTE only works on one card at a time, or requires a second card to be disabled for verification.
Impact on autonomy and traffic consumption
There is a myth that voice over LTE consumes Internet traffic. In fact, the codecs used to compress voice (such as AMR-WB) are very effective. A minute of conversation takes only about 0.5-1 MB of data. Operators take this traffic separately and do not subtract it from your main gigabyte package if the service is connected correctly.
As for the battery, the modern Qualcomm and MediaTek modems installed in Xiaomi smartphones are optimized for VoLTE. In frequent short call scenarios, autonomy even increases, as the energy-intensive process of finding a 3G network after each LTE connection break is eliminated.
However, if the signal 4G Very weak (1 division), the phone will constantly try to hold the connection, which can lead to heating of the case and accelerated discharge. 3G» or to disable VoLTE manually.
⚠️ Note: When roaming abroad, using VoLTE can lead to unpredictable costs if your operator does not have agreements with local voice networks. LTE. When traveling, it is better to turn off this function.
So for most users in the safe-to-receive zone, the technology is extremely useful, providing comfort and connectivity, becoming the de facto standard in today's mobile communications.