How to enable VoLTE on Xiaomi Redmi Note: Full Guide

Xiaomi’s modern Redmi Note series provides users with a wide range of features for high-quality voice communication. One of the key technologies that ensure crystal clear sound and simultaneous Internet operation during a conversation is VoLTE (Voice over). LTE). Many owners face a situation where, after installing a new one, SIM-map or firmware updates desired icon HD The quality of the communication remains at the level of old standards.

This feature is often enabled automatically, but in some cases requires manual intervention in system settings or interaction with a carrier, which may be due to the features of regional versions of firmware, the specifics of the operation of specific mobile operators or software failures of the MIUI and HyperOS shell. Understanding the principles of the technology will help you quickly activate HD Voice and enjoy improved communication.

In this guide, we will go through all the steps of activation, from checking support by the operator to using hidden engineering menus, you will learn why the icon can disappear and how to force the service to run where it is not activated itself.

Verification of support of the technology by the operator and the tariff

Before digging into Xiaomi’s smartphone settings, make sure your carrier provides fourth-generation voice-enabled communication services. Not all tariff plans automatically include this option, even if your city has coverage. 4G Often, explicit connection of the service through a personal account or USSD-request.

Larger operators usually activate the function automatically when a device is first logged in to the network. LTE, If the phone supports the standard, but in some cases, especially when changing SIM-Newer cards (with support) 4G), Check the status of the service in your operator’s application or on the official website in the tariff section.

⚠️ Attention: If yours SIM-The card was released several years ago and has no markings. 4G/LTE, It may not physically support the transmission of voice through LTE. In this case, you must replace it free of charge. SIM-map in the operator's communication salon to the new one with the support of modern standards.

Roaming is also worth considering: When you are in another region or country, VoLTE may not be available even if it worked perfectly at home, and in such situations, the phone will automatically switch to 3G or 2G standards to make calls, which is normal behavior of the device.

Basic activation through the standard settings menu

The easiest and safest way to enable the technology is to use the standard Android settings menu. In current versions of Xiaomi shells, this switch is usually open access if the system has determined a compatible one. SIM-First, make sure that the device is installed. SIM-support-card 4G and mobile data transmission is enabled.

Go to the settings section, select a paragraph «SIM-Maps and mobile networks. Here you need to find your main network. SIM-If the operator supports the technology and the profile is loaded correctly, you will see the "Use VoLTE" or "Calls through" switch. LTE». Activation of this switch starts the process of registering the phone on the network IMS (IP Multimedia Subsystem).

Sometimes, when the switch is turned on, you need to restart the device, so that the modem can re-register on the network with the updated settings. If the HD icon or VoLTE sign does not appear in the status bar after the reboot, try turning off and re-energize the flight mode to force the reconnection to the tower.

Using an engineering menu to force inclusion

In situations where the standard switch is missing or not working, the engineering menu comes to the rescue, which is a hidden part of the system, designed for testing equipment by engineers, but also available to ordinary users. Be careful: changing unknown parameters can lead to unstable operation of the communication module.

To enter the menu on Redmi Note smartphones, open the Phone app and dial the combination ##4636##. If the code is entered correctly, the Test menu will open. Select Phone Information. From the list that opens, search for the option “VoLTE provisioned” or “Installed VoLTE” and check the box.

#4636## - Code to enter the test menu

Once you tick the icon may not appear instantly. Try making a test call or sending an SMS. If the tick is reset or the menu doesn't open, your firmware version may be blocking access to these settings, which will require using third-party apps or changing the region.

⚠️ Warning: Do not change other options in the engineering menu, such as "Preferred network type", unless you understand their purpose, LTE Only) may result in a complete loss of communication and the ability to receive incoming calls.

Set up network parameters and select a region

One common reason for the lack of VoLTE feature on global versions of Xiaomi smartphones is the region chosen.Some operators or network settings may be hidden for certain geographic areas. Changing region in phone settings often solves the problem of the "missing" switch.

Go to "Settings» → «Additionally» → «You can try to pick a country where the technology is very advanced, like India, Indonesia or Singapore, and when you change region, the phone will reset the network profile. SIM-Check if the switch is there and see if the switch is there.

Also make sure that the network type is selected in the mobile network settings “Preferred” LTE» (Preferred LTE). If the regime is chosen «3G/2G» or "Only" 2G», voice-over LTE It won’t work physically because the phone won’t connect to fourth-generation networks.

Solving problems with the HD icon and indicator

Often users complain that calls are made via LTE (the internet does not turn off during a conversation), but the VoLTE or HD icon in the status bar is not displayed.This can be a software feature of the MIUI shell or status display settings.

You can test the real work experimentally. Turn on mobile data, start downloading a file or open a heavy page, and at the same time initiate a voice call. If the Internet (4G/LTE) has not switched to 3G/H+ and the speed has not dropped to a minimum, then VoLTE is active, regardless of the icon.

If you're looking at the indicator, try clearing the Settings cache or resetting the network. Path to reset: Settings → Connection and Sharing → Resetting Wi-Fi, mobile networks and Bluetooth. This action will bring all network settings back to factory values, often eliminating software glitches.

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If the VoLTE icon is gone after a system update, try re-entering your carrier’s APN settings. Sometimes, after a firmware update, old APN profiles conflict with new network protocols.

Frequent errors and ways to fix them

Even with the right settings, you can have failures, and one of the common mistakes is that you have two things that are in conflict. SIM-If both cards are inserted, but only one supports 4G, The phone may try to use the second card for voice, ignoring the capabilities of the first. SIM-map and check the work of VoLTE on the main.

Another problem is the outdated version of the baseline (modem firmware). Xiaomi system updates often contain fixes for communication modules. Go to Settings → About Phone → System Update and check for new versions of the software. Installing current firmware can solve the problem of compatibility with the operator towers.

⚠️ Note: When using custom firmware or Unlock Bootloader, VoLTE functions may not work stable or be completely disabled due to the lack of operator safety certificates.

It's also worth checking if the power saving mode is activated for the Phone application or system services. Aggressive charge saving can block background registration processes in the IMS network. Add system communication applications to the battery exception list.

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The most common reason for VoLTE not working is not the phone settings, but the lack of service on the operator side or outdated. SIM-Always start your diagnosis with a call for operator support.