VoLTE icon on the Xiaomi screen: decryption and configuration

Xiaomi smartphone users often notice a new VoLTE icon on the lock screen or in the top notification bar. This symbol can look like an inscription or a specific icon of a phone with letters inside. The appearance of this indicator is not a system error or a sign of a virus, but indicates the activation of modern voice data technology.

Owners of Redmi and Poco devices may not immediately know why this mode is needed and whether it affects traffic consumption. In fact, the technology allows you to make calls directly over a fourth-generation network, bypassing switching to 2G or 3G. This provides instant connection and the ability to use the Internet during a conversation without losing speed.

In this article, we will discuss in detail the technical aspects of this function, how to force it to turn on through the engineering menu and hidden settings. MIUI. You will learn how to activate HD-calls even on those models where the operator did not provide automatic settings, and solve problems with the missing icon.

VoLTE Technology: How it Works on 4G Networks

Voice over LTE is literally translated as “Voice over LTE.” Traditionally, 4G networks were created solely for packet data (the Internet), and for voice calls, the phone automatically switched to 2G or 3G standards. This switching process took time, which caused the subscriber to hear the beeps not immediately after dialing.

VoLTE technology eliminates this latency by packing the voice stream into the IP-packets identical to Internet traffic. Xiaomi smartphone in this case does not leave the coverage area 4G, This is especially important in regions where third-generation coverage is already degraded or missing, and the signal is not being used. 2G too weak to communicate comfortably.

A key advantage is the simultaneous operation of voice and data.Without activated VoLTE when an incoming call, the Internet connection often breaks or falls to EDGE.With the feature enabled, you can continue downloading files, navigation or online games in high quality while the conversation is ongoing.

• 📞 Instant connection: dialing the number for 1-2 seconds without long waiting for the horns.
• 🌐 A stable Internet: the ability to use 4G-network during a conversation without switching to 3G.
• 🔊 HD-Quality: High-resolution voice transmission provides clean sound without noise or distortion.

⚠️ Note: VoLTE uses traffic, but most operators charge it as normal packet minutes, not as Internet traffic.

To work the technology requires support from three components: the smartphone Xiaomi, SIM-If at least one element does not support the standard, the icon will not appear on the screen, and the phone will return to the classic mode of operation.

Verification of support by the operator and tariff plan

Before looking for settings in the MIUI menu, make sure your mobile operator provides Voice over LTE. In Russia and CIS, most major providers have already implemented this technology, but it may not be available on old tariff plans or in other regions.

Users often forget that they themselves SIM-The card must be updated to the standard USIM. If you use a card issued more than 5-7 years ago, it may not physically support the necessary encryption protocols for the HD-In that case, replacing the SIM in the salon will solve the problem.

It is also important to check whether the service is blocked at the profile level of the subscriber. USSD-The team, even if the phone is technically ready to go.Without this activation, the VoLTE icon on the Xiaomi screen won't catch fire.

For example, for some carriers, it can be a command in 111# or a setup via the My Operator app. Once the service is connected on the network side, the phone must receive updated profiles.

Hidden MIUI settings: activation via engineering menu

HyperOS shell and older versions of MIUI often lack an explicit VoLTE switch in the standard settings menu, especially for Russian regions. To unlock this feature, you need to use the hidden Android engineering menu.

To enter the diagnostic menu, open the Phone app and dial the combination ##4636##. If the code works, the Check or Testing menu will open. If the code does not work, the manufacturer may have blocked access to it and you will need to install a special activator application from the Google Play store.

In the menu that opens, select Phone Information. Scroll down to find the VoLTE Provisioned or Enable VoLTE switch. Activate the switch. If the icon appears in the curtain after turning on, but disappears after rebooting, additional settings are fixed.

In some cases, Xiaomi requires multiple switches to be activated at the same time, such as VoLTE and Vt (video calls) and beware: changing other options on this menu, such as the type of preferred network, can lead to loss of communication.

Using Xiaomi EU app and hidden features

If standard methods don’t work, many Xiaomi users resort to installing hidden features through special activation apps. One popular solution is to use utilities that open access to hidden toggles in system settings without the need for root rights.

Xiaomi EU app or analogues allow you to tick the “Allow VoLTE to be enabled” box in the “About Phone” menu, you need to repeatedly click on the kernel version or use third-party software that emulates this process, and then the desired switch will appear in the normal cellular settings.

It is worth noting that on global firmware versions this option is often already unlocked, but hidden if SIM-The card is not defined as a support standard. Forced software activation ignores operator verification, forcing the phone to broadcast support for VoLTE constantly.

⚠️ Attention: Installation of third-party APK-Files from unverified sources may carry security risks. Use only proven open source activation tools.

After activation through the application, it is recommended to restart the smartphone and check for the icon. If the HD or VoLTE icon appeared next to the network indicator, then the system has switched to high-quality voice transmission mode.

Technology comparison: VoLTE vs VoWiFi vs 3G

Users often confuse different communication standards. To understand the value of VoLTE, you need to compare it with alternatives. Conventional 3G calls (CSFB) require switching a radio module, which interrupts an Internet session. VoWiFi works similar to VoLTE, but uses a Wi-Fi network instead of an operator tower.

Below is a table showing the key differences between voice technologies in today’s Xiaomi smartphones.

VoWiFi is useful in areas of insecure cellular reception, but with stable 4G, VoLTE is the preferred option, and it provides better mobility, because it is independent of the Wi-Fi hotspot.

When switching between modes, the phone can lose network for a short time. Modern Snapdragon and MediaTek processors used in Xiaomi can quickly switch between VoLTE and VoWiFi, ensuring continuity.

Problem Solving: The icon is missing or not appearing

A situation where the VoLTE icon suddenly disappeared after a firmware update or change SIM-The first step should always be to check the basic settings: make sure that the Settings menu is on the Settings menu. → SIM-Maps and mobile networks included item "Use VoLTE».

If the switch is missing or inactive, try resetting network settings. Go to Settings → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth.This action will delete stored Wi-Fi passwords, but often resolves program conflicts of the operator profiles.

In rare cases, frequency incompatibility is a problem. If you're roaming or in a border area, the phone can cling to a tower in a neighboring region where your carrier has not licensed VoLTE, in which case manual network selection in settings will help.

It's also worth checking if power saving mode is on, which can limit the background processes of the communications module. On Xiaomi, aggressive power saving sometimes disables additional radio module features to extend battery life.

The impact of VoLTE on autonomy and traffic

There is a myth that VoLTE is much faster to plant a battery, and in practice, the opposite is true: since the phone does not have to constantly jump between 4G and 3G standards, the power consumption of the radio module decreases.

As for traffic, voice flow in the AMR-WB codec (broadband) consumes about 0.5-1 MB per minute. Operators usually do not take this amount into account in gigabytes of the Internet, but charge as minutes. However, if you have a tariff without minutes, and only the Internet, calls will go through traffic.

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For maximum charge savings in low signal areas, turn on 4G Only mode in the engineering menu, but be prepared for the fact that incoming calls may not pass if VoLTE does not work.

Users with unlimited rates don’t have to worry about data consumption, and the technology is optimized to prioritize voice packets, ensuring they are delivered in priority even when the network is congested.

FAQ: Frequently Asked Questions

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VoLTE is the future communication standard that delivers better sound quality and connectivity stability, and it’s worth activating on any compatible Xiaomi smartphone.