Xiaomi and Redmi users often notice a strange VoLTE icon in the status bar, the appearance of which raises many questions. Many perceive this icon as an accidental failure or an unnecessary feature, unaware that it hides a modern voice standard. In fact, the presence of this symbol indicates that your device is connected to the fourth generation network and ready to provide crystal clear sound during a conversation.
Voice over LTE technology allows you to transfer voice calls through 4G batch data, bypassing the switch to outdated 2G or 3G standards. This is not just a marketing feature, but a real step forward as a mobile communication, which is especially important for owners of budget and medium-budget devices of the Redmi Note or Redmi K line. Understanding the principles of this feature will help you set up your phone as efficiently as possible.
Xiaomi device owners appreciate the functionality of the MIUI and HyperOS shells, where network management is brought into a user-friendly interface. However, sometimes the system requires manual intervention to activate all the features. Next, we will discuss in detail why this icon burns, how to manage it and what to do if the desired icon never appeared after turning on.
Technological essence: how voice works through LTE
Traditionally, mobile networks were divided into two parallel infrastructures: one was responsible for data transmission (the Internet), and the other for voice communication. When you dialed a number on an old phone, the device forced to switch from fast 4G to slow 2G or 3G, interrupting an Internet session. VoLTE eliminates this problem by allowing voice to "travel" in the form (data packets) of the same high-speed channel.
For Xiaomi's smartphone, this means that the processor doesn't have to constantly switch radios between different frequency bands.The voice signal is encoded in digital format and transmitted via a voice signal. IP-It's a protocol, similar to instant messenger calls, but with priority in the operator's network, and it provides instantaneous connectivity -- you hear the beeps almost immediately after you press the call button, without the usual delays.
HD Voice audio quality is far superior to standard calls, the frequency range is widened to make speech more natural, removing the effect of metallic voice, and the technology allows simultaneous conversation and fast Internet access, which is critical for navigation or email during an important call.
Operators are embracing this technology everywhere, freeing up 2G and 3G frequencies for other uses or simply increasing network capacity. Redmi smartphones equipped with modern Qualcomm or MediaTek modems fully support this standard as long as it is activated at the software level and allowed by the SIM card.
Why you need this feature for the owner of Xiaomi
Using VoLTE on Xiaomi devices offers a number of tangible benefits that improve the user experience, primarily the stability of the connection: in places where the 4G signal is weak but present, voice communication will remain available, whereas a normal call could be cut off when trying to switch to 3G. This is especially true for country houses, office buildings with thick walls and underground parking lots.
The second important aspect is energy efficiency, because the phone doesn't have to jump between communication standards all the time, battery consumption decreases, and the communication module is more relaxed, which has a positive effect on the autonomy of popular models like the Redmi Note 12 or Xiaomi 13, and you'll notice that the phone is less warm during long conversations.
- 📶 Simultaneous work: the ability to sit freely on the Internet, watch videos or play online while talking without dropping the speed to the Internet. EDGE.
- 🔊 High quality: support for broadband codecs makes the interlocutor audible clearly, even in noisy environments.
- ⚡ Connection speed: the call installation takes place 1-2 seconds, not in 5-7, like a regular network.
It’s also worth noting that many carriers are gradually shutting down 2G and 3G networks, shifting all traffic to 4G and 5G. In such conditions, having a running VoLTE becomes not just a convenience, but a necessity for making calls. If your phone does not support this feature or it is disabled, in the future you may face a complete lack of communication in some areas.
How to find and activate VoLTE in MIUI
The feature on Xiaomi smartphones is usually enabled automatically if the SIM card and operator support the standard. However, in some regions or when using two SIM cards, the settings may be confused. To check the status or activate the option manually, you need to go to the settings menu. The path may vary slightly depending on the version of the MIUI shell or HyperOS.
Go to Settings, then select the item SIM-Maps and mobile networks. Here you need to select the specific SIM card you want to set up a connection for. In the menu that opens, look for the switch Use VoLTE or Calls on the Internet. LTE. If the switch is active, the icon in the status bar should appear immediately or after the device is restarted.
☑️ Verification of VoLTE activation
Sometimes the menu item may be hidden, so try typing the code ##86583## into the engineering menu. Once you enter, you should see a message that says "VoLTE Carrier check was disabled" (or enabled), which unlocks hidden settings in the interface. Be careful when using engineering codes, only change the settings you are sure of.
⚠️ Note: If the icon doesn’t appear after switching on, your carrier may not have certified the phone model to work on its network.This is common with global versions of Xiaomi that are not purchased from official dealers in your region.
Why the icon may not appear or disappear
The lack of a VoLTE icon when the feature is turned on is a common problem that has several reasons. Most often it is the absence of an operator profile in the phone's database. Xiaomi uses compatibility lists, and if your provider is not there, the system can block the icon's display even if the technical connection is working.
Another reason is outdated firmware: Basic modems are updated with Android versions and the shell. If you haven't updated your phone in a long time, there may be bugs in your version of the software that prevent you from registering correctly on the IMS network.
It is also worth checking if the service is activated on the operator side. USSD-commands or connect an option via a personal application. Without permission from the base station, the phone will not be able to initiate a VoLTE session.
- 📱 Two SIM cards: when two numbers are simultaneously working, one of them can be forced to switch to the SIM card. 3G Incoming call if the second person is actively using the Internet.
- 🌍 Regional restrictions: Chinese versions of smartphones (CN) may not have settings for European or Russian operators without flashing.
- 🔧 Network failure: temporary problems on communication towers can lead to a rollback to the standard 3G, smack-out.
You can use Cell Info Lite or similar to diagnose it, which shows the real type of connection (LTE, 3G, 2G) at the time of the call, and if the phone stays in LTE mode during the call, then the technology works even if the icon is hidden by the system.
Comparison of communication standards: Characteristics table
To better understand the difference between a conventional call and a modern standard, consider a comparative table that will help you assess the significant benefits of the new technology for everyday use of the Redmi smartphone.
| Characteristics | 2G / 3G (CSFB) | VoLTE (4G/LTE) | VoWiFi (Wi-Fi Calling) |
|---|---|---|---|
| Connection speed | 5-10 seconds | 1-2 seconds | 2-4 seconds |
| Sound quality | Low/Mediocre | HD (High) | HD (High) |
| The Internet | Interrupted or slowed down | Full speed 4G | Wi-Fi channel. |
| Battery consumption | High (frequency switching) | Low. | Medium (depending on Wi-Fi) |
As you can see from the table, the transition to VoLTE brings productivity and comfort, but it is worth remembering that in areas of uncertain 4G reception, the phone will still switch to 3G for stability of communication, since voice packets require a more stable channel than conventional web surfing.
What is VoWiFi and how is it related?
Impact on traffic consumption and battery
There's a myth that VoLTE calls consume Internet traffic. It's not quite true. Although technically voice is transmitted as data, billing operators allocate this traffic to a separate channel, it's either not charged at all, or it's included in a packet of minutes, not a gigabyte. In the tariff plan settings, this is usually written in a separate line.
In terms of power consumption, VoLTE saves power. Network search and intergenerational switching (2G/3G/4G) is one of the most energy-intensive processes for a radio module. Operating in a single standard, the phone lessens the CPU and antenna.
However, if the 4G signal is very weak (single division or constant jumps), the phone will spend more energy amplifying the signal, in which case it is advisable to temporarily switch the network to 3G mode, preferably in settings, to save charge, although the quality of communication will fall.
⚠️ Note: When roaming abroad, make sure you have VoLTE roaming service connected. otherwise, the phone may try to register with local networks 4G It's just for data, and calls will go through 2G with high tariffs, or the connection may not work at all.
Solving Frequent Problems and Hidden Settings
If standard methods didn't work, you can try deeper settings. In some versions, MIUI helps reset network settings. Go to Settings → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth. This action will delete stored Wi-Fi passwords and Bluetooth settings, but can correct login errors in the operator's network.
Another method is manual APN settings, go to your mobile network settings, select your SIM card, and go to APNs, find the active point, click on it, and make sure that the APN type field spells out default,supl,ims. Having ims is critical to LTE voice services.
default,supl,imsIf the field is empty or has other values, write.ims in comma without spaces and save the settings. After that, be sure to restart the smartphone. This method often helps on Chinese versions of firmware, where the right parameters for local operators are not initially prescribed.
💡
If you often move between areas with different coverage, set the network settings to 4G/3G/2G (auto) mode so that the phone chooses the best standard without getting stuck on weak 4G.
In extreme cases, if nothing helps, you can try installing third-party enhancers from Google Play that force the activation of hidden Android flags. ADB-commands that are not recommended for ordinary users due to the risk of breach of warranty.
💡
Properly configuring APN with the “ims” option often solves the problem of not having a VoLTE icon on global versions of Xiaomi, even without flashing it.