With modern Xiaomi smartphones, users often notice a new icon in the status bar next to the signal indicator. This small but important VoLTE icon signals the device’s transition to a new voice standard.
Many owners of Redmi and Poco are wondering if the symbol is a cause for concern or, conversely, evidence of the correct operation of the phone. In fact, it is a positive signal indicating that your device uses a high-speed 4G LTE network not only for the Internet, but also for voice calls.
Next, we will discuss in detail the technical features of this technology, how to force it to activate on Xiaomi devices and how to solve typical problems when the icon does not appear or burns in red.
Technological essence and advantages of the standard
VoLTE stands for Voice over LTE, which literally means Voice over LTE. Traditionally, mobile networks were switched to call channels (2G/3G), and switched to packet transmission (3G/4G) to transfer data. When calling while using the Internet, the phone often resets the connection to 3G or even 2G, which led to a break in page loading.
Voice over technology LTE eliminates this disadvantage by transmitting voice stream as normal internet data in the form of IP-This allows you to talk and use high-speed Internet simultaneously without switching the network modes, and the sound quality gets much higher as you get closer to the Internet. HD-audio, and the connection time with the subscriber is reduced to 1-2 seconds.
It is important to note that this feature requires support from the operator and the smartphone itself. Xiaomi devices of recent years are fully compatible with the requirements of the operators of the “big four” in Russia and the CIS. Activation of the function allows you to save battery power, since the communication module does not need to constantly switch between 3G and 4G standards.
⚠️ Note: Using VoLTE can consume traffic depending on your carrier’s tariff plan, although most modern tariffs already include unlimited packages for voice calls through the Internet. LTE.
The main advantage of the technology is that it's stable in places where there's a lot of uncertainty. 3G-signal may be interrupted, packet data transmission through LTE often remains stable, ensuring continuity of conversation.
How to enable VoLTE on Xiaomi smartphones
In most cases, modern firmware MIUI HyperOS automatically activates the function when installed SIM-If the icon does not appear, however, you need to check the settings manually. The first step is to make sure that the phone has the correct type of network.
To activate, go to your device's settings menu. Find the section that handles SIM card settings and mobile networks. The path may vary slightly depending on the shell version, but the logic remains the same for all Xiaomi models.
☑️ Checking network settings
After switching on, restart the device if the operator supports the technology and SIM-card registered online 4G, The status bar should have an indicator that is appropriate, and in some regions or operators, the option may be hidden by default.
If a standard switch is not available, you can use an engineering menu or a special code to activate hidden functions. Enter the code ##86583## in the Phone app. If you see a message "VoLTE Carrier check was DISABLED", then the operator check is disabled and the function should work. Re-enter the code will enable the check back.
Configure through the engineering menu and hidden options
In situations where standard methods don't work, or the function is blocked software, you can turn to deeper system settings. Xiaomi's Engineering menu provides access to control of the radio module. Be careful when changing parameters, it is better not to touch unfamiliar settings.
To enter the extended menu, dial ##4636##. From the list that opens, select Phone Information. Scroll down to Set Preferred Network Type. Select an option that contains LTE, such as LTE/TD-SCDMA/CDMA/EVDO/GSM/WCDMA.
What if the code doesn't work?
There may also be a separate "VoLTE provisioned" switch on the menu, which must be activated (check or switch on), and the phone may then need to reboot or simply reconnect to the network.
Remember that interference with the system settings of the radio module can lead to unstable communication. If after the changes, the signal or the Internet is lost, return the network type setting to the default value or simply choose LTE.
Table of compatibility and status of the indicator
The behavior of the icon can vary depending on the network status and the phone model. Understanding the different states of the indicator helps diagnose communication problems. Below is a table describing the main display options.
| Status of indicator | Meaning | User actions |
|---|---|---|
| VoLTE (grey/white) | The function is active and ready to go | There is no need to do anything, the connection works in HD. |
| Absence of a badge | The function is turned off or not supported | Check SIM settings and availability of 4G coverage |
| Exclamation mark badge | Error of registration in IMS network | Reboot your phone or replace it SIM-map |
| HD next to the signal | Alternative designation of VoLTE | Some operators use HD marking instead of VoLTE |
It is important to consider that the visual design of the status bar depends on the theme of the design installed on your Xiaomi.In some custom themes, the icon may look different or be hidden.
If you see the icon, but the calls still break down or the Internet goes down during a conversation, the problem may be on the operator's side. Try moving to the area with a more confident reception signal.
Display problems and methods of their solution
Despite the support of the technology, users often face a situation where the icon does not appear. one of the common reasons is an outdated version of the firmware or incorrect APN settings.
Another common reason is the old one. SIM-If your SIM is used more than 5-7 years and doesn't have a chip 4G/LTE, In this case, you need to contact the operator's communication salon for a free replacement of the card with a new one with support. USIM.
- 📱 Make sure that the “Preferred” mode is selected in the mobile network settings 4G» or «LTE».
- 🔄 Try to get it out. SIM-map, wipe the contacts and paste back.
- 📡 Check if VoLTE is activated in your operator’s personal account (a separate connection is often required).
- 🔌 Reset your network settings to factory settings in the Connections and Sharing menu».
If nothing helps, your particular phone may not be certified to work with VoLTE from a specific carrier, a common occurrence when buying “global” versions of Chinese phones or devices imported on parallel imports.
Impact of the telecom operator and tariff plan
The technology only works when two parties interact: the device and the operator’s network. Even if Xiaomi is set up correctly, the operator must support voice over LTE in your region. Large federal operators have already covered huon territory of cities with this service.
Some plans may restrict the use of VoLTE. For example, in archival rates, this option may not be available. Check the terms of your current service package. Often, it is enough to send a message to activate. USSD-request or use the operator's application.
⚠️ Note: When roaming (located in another country), VoLTE may not work or be charged as a regular voice call, even if you use the Internet.
It’s also worth considering that when you call a number that doesn’t support VoLTE or is in a zone without 4G coverage, your phone will automatically switch to 3G or 2G standard.