How to turn VoLTE on Xiaomi: The Complete Guide

Modern mobile communications has moved to a new level, where voice calls no longer require network switching. LTE) It allows you to transmit high quality voice directly through 4G-network, providing instant connection and the ability to simultaneously use the Internet. POCO Often faced with a situation where the icon HD or VoLTE is not displayed, although the operator supports the function.

Before you start to manipulate the engineering menu in a complex way, you have to make sure you have the basic conditions. SIM-The operator must support voice transmission through LTE If you're in a safe reception area. 4G, But the icon doesn't show up, so you have to check if the service is activated on the provider side, and many operators connect it automatically, but some require manual requesting through the service. USSD-team.

In this article, we will look at all the ways to activate the function, from standard system settings to the use of hidden codes. You will learn how to turn on the engineering menu to force the option to activate if the standard path is not available. We will also analyze the typical errors when the phone shows 4G, but switches to 3G or 2G during the call, which indicates that VoLTE is not working correctly.

Checking the compatibility of the operator and SIM-map

The first step should always be to diagnose the terms of service. Even the most powerful flagship Xiaomi Mi or Redmi Note will not be able to broadcast voice through the service. LTE, If the SIM card does not support this standard, make sure your SIM-The card is not an old model, released many years ago. Replacing the card with a new one in the operator's cabin often solves the problem instantly.

You also need to check the settings of the tariff itself. Some old plans do not include the option to use VoLTE by default. Contact your carrier's technical support or use a proprietary application. In most cases, you need to send a short message to activate. USSD-For example, for MTS, this is a team *111*727#, and Beeline — *117*0023#. U Tele2 Megaphone service is often activated automatically when a compatible device is available.

⚠️ Note: If after replacement SIM-The card and tariff check icon didn't appear, don't rush to reset your phone to factory settings.

It's important to understand the difference between having a 4G network and having VoLTE. You can see a 4G or LTE icon in the status bar, but when you call it, the indicator will drop to H+ or 3G. This is a direct sign that Voice over LTE technology is not active, and in these situations, the Internet may be interrupted or very slow during a conversation.

📊 What kind of operator do you have?
MTS
Megaphone
Beeline
Tele2
Other

Standard activation through the smartphone menu

In most current versions of the shells MIUI The path to the switch may vary slightly depending on the Android version and the firmware region. Usually you need to go to Settings, then select a point. SIM-maps and mobile networks. Here you'll see a list of SIM cards installed.

Choose the right one. SIM-In the menu that opens, find the Use VoLTE or Allow VoLTE switch. If there is no such option, try clicking on the network type (e.g., Preferred Network Type) and select the option where it is clearly stated Preferred LTE. Sometimes activation only occurs after selecting a specific type of network.

☑️ Checking network settings

Done: 0 / 5

If the switch is found but is inactive (gray) or returns to its original position, this indicates a conflict of software settings.

  • 📱 Restart the device to update the registration in the operator’s network.
  • 🔄 Extract. SIM-map, wipe the contacts and paste back.
  • 🌐 Make sure that the "Mobile network" includes data transfer.

On some global firmware, the menu item may be hidden if the operator is not listed on the Xiaomi whitelist, in which case it will not work with standard methods to enable the function, and you will need to use the engineering code, which will be discussed below.

Activation through the Engineering Menu (CIT)

If the standard settings interface does not include VoLTE, Xiaomi owners can use the hidden engineering menu, which is a powerful tool for testing hardware and software components of the phone. Be careful when changing the settings in this menu, as improper actions can affect the stability of the communication module.

To enter the menu, you need to open the Phone app and type a special code. Depending on your device's processor (Snapdragon or MediaTek), the codes may differ. The most universal code for Qualcomm processors is ##4636##. Once you enter the last characters, the menu should open automatically.

##4636##

After you go to the menu, select Phone Information. Scroll down to Set Preferred Network Type. In the dropdown, select an option that says LTE and IMS or VoLTE. For example, LTE/TD-SCDMA/CDMA EvDo/GSM/WCDMA. The presence of an IMS box often indicates support for VoLTE.

⚠️ Warning: Do not change settings in areas where you do not know the value. Resetting a radio module may cause temporary loss of network or inability to make calls.

Also on this menu is often a separate VoLTE Provisioned or Enable VoLTE switch. Make sure the tick is set next to it. Once the settings change, the phone may lose the network for re-registration for a short time. If the HD icon appears in the status bar, then the manipulations were successful.

What if the code doesn't work?
Some operators or firmware block the login to the engineering menu through a standard call, in which case you can try installing the "Activity Launcher" application from Google Play, find in the list "Settings" -> "Testing and start activity "CIT" or "Testing"."> Solving problems with lack of badge HD There are situations when all settings are made correctly, the engineering menu confirms the activation, but the cherished letter HD It never appears in a status bar. It's a visual interface bug. MIUI. Functionally, VoLTE can work (calls don't reset the network), but the indicator is hidden. To fix this, you need to activate a hidden flag in the system. MIUI, To open "Advanced Settings." You need to find the option "Enable VoLTE carrier check" and disable it. This action removes the software ban on displaying the icon for operators outside the Xiaomi partner network. If this method did not help, you can use the MIUI Hidden Settings application or similar utilities to access hidden system functions. Search by settings, type the word "VoLTE". The system can produce hidden switches that do not appear in the standard interface. Activation of such hidden options often solves the problem on global versions of firmware. Symptoms Possible Reasons No Items in Settings Restricting Firmware Code or Change of Region Badges are, but calls via 3G Weak LTE Signal Change of Location or Antenna Error Not Registered on the Network Missettings APN Resettings Access Point Settings Badge is missing after updating Configuration Failure through the code Influence of Region and the firmware Version Xiaomi Company Policy involves sharing functionality for different markets. On Chinese versions of smartphones (CN Version), VoLTE support is built-in by default for local operators. On global versions (Global ROM) The list of access points, the phone can sometimes help the phone to bring backup, the phone, the phone can be limited. Go to Settings. → Additionally. → Region and select the country where your carrier officially supports VoLTE (for example, India or Russia). After changing region, restart your smartphone and check for new items in the SIM card menu. However, it is worth remembering that firmware of the Chinese version of the software on the global phone (or vice versa) without proper preparation can lead to the inoperability of banking applications (NFC, Google Pay and the appearance of advertising in the system. Region affects not only the language, but also the configuration lists of networks (Carrier Config). 🇨🇳 CN ROM — Maximum support for functions, but there may be frequency issues LTE (Band 7, 20). 🌍 Global ROM — Optimized for the world, but can hide some features for specific operators. 🇪🇺 EU ROM — European version, often devoid of advertising and has advanced settings. 💡If you travel frequently, set up access points (APN) It's not always the automatic settings that prescribe the parameters correctly. IMS Frequently Asked Questions for VoLTE (FAQ) Does turning on VoLTE affect battery consumption? VoLTE is designed to be energy efficient, because the phone doesn't have to constantly switch between modes. 4G and 3G When you call, you can even reduce your battery consumption, but in areas where you're not receiving it. 4G The communication module is more intensive, which can increase energy consumption. Will VoLTE work if I am roaming? It depends on the agreement between your home operator and the host country operator. Even if the phone technically supports the feature, the VoLTE roaming service is often disabled by default or requires a special option to be connected. The badge may not appear and the calls will go through 3G/2G. Can VoLTE be enabled on very old Xiaomi models? the feature requires an appropriate modem and support from the processor. 2016-2017 years (e.g. Redmi) 3, 4A), They may not have hardware support. IMS, necessary to transmit the voice through LTE. In these cases, software won't help. Why does the Internet stop working after a call? It's a classic sign that VoLTE is not activated. 3G, If there's no data, or if the access point's settings are lost, the Internet goes missing. APN Make sure the VoLTE switch is lit blue.