VoLTE on Xiaomi: what is this icon and how to activate it

Owners of Xiaomi, Redmi and Poco smartphones often notice the appearance of a new icon in the status bar after a system update or change. SIM-Instead of the usual letters. 4G or LTE The message VoLTE appears next to the signal indicator, and for many users, this becomes a cause for concern: what has changed in the phone’s operation and whether it is necessary to interfere with the settings?

In fact, the introduction of this indicator is a sign of a shift to a more modern voice standard, which allows voice calls to be transmitted over fourth-generation networks, providing crystal clear sound and instant connectivity, and owners of Xiaomi devices do not need to panic, as it is a regular feature designed to improve the quality of communication.

However, sometimes the icon can disappear or burn permanently even where there is no 4G network, which raises questions about traffic consumption. Understanding the principles of Voice over LTE will help you effectively manage your smartphone settings and save battery power without sacrificing communication quality.

Decoding of the abbreviation and the principle of operation

VoLTE is derived from the English words Voice over LTE, which literally translates as "Voice on top of LTE." Traditionally, mobile networks used different technologies for data and voice: 4G (LTE) was intended for the Internet, and for conversations the phone switched to older 2G or 3G standards. This process of switching took time and reduced the quality of sound.

VoLTE eliminates the need for switching. Voice stream is digitized and transmitted as normal Internet traffic in data packets, but with high priority. This allows you to simultaneously talk and use high-speed Internet without dropping speeds to EDGE or 3G. On Xiaomi smartphones, a modem integrated into the processor is responsible for processing these flows.

The key advantage is the use of high-resolution codecs, where if a regular call compresses sound to a narrow range of frequencies, HD Voice in LTE networks transmits the full spectrum of human voice, which makes the speaker's speech more natural and legible, especially in noisy places.

⚠️ Note: VoLTE may consume Internet traffic, but most operators do not charge this data as part of voice packets. However, if you do not have unlimited access to the network, it is worth checking with the provider.

It’s important to understand that the technology needs support from three sides: your smartphone, SIM-If at least one element of the circuit does not support the standard, the phone will automatically go into mode. 3G or 2G call-in.

The main advantages of the technology for Xiaomi users

The shift to modern communication standards brings tangible benefits to everyday smartphone use. Redmi Note and Mi flagship series users are the first to notice improvements in sound quality. Connection is set up almost instantly, and long waiting beeps disappear before starting a conversation.

Another important aspect is the ability to use voice and data simultaneously. In older networks, when an incoming call was made, the Internet connection was interrupted or slowed down greatly. With active VoLTE, you can continue playing online games, watching videos or downloading files while talking without losing 4G speed.

The technology also helps to save energy: A smartphone doesn’t have to constantly switch between 2G, 3G and 4G frequencies, which reduces the strain on the antenna module and the processor, especially in areas of uncertain reception, where the phone usually begins to actively search for the network.

• 📞 Instant connection: dialing and the start of the beeps occur without delay.
• 🌐 Simultaneous operation: stable 4G Internet during a conversation.
• 🔊 HD-Quality: clean sound without distortion or noise.
• 🔋 Energy savings: no constant switching between generations of networks.

How to enable VoLTE on Xiaomi and Redmi smartphones

In most modern Xiaomi models with MIUI or HyperOS shell, the function is enabled by default if the operator supports the technology. However, in some regions or on global versions of firmware, access to the settings may be hidden.

The standard path is as follows: open Settings, select a paragraph. SIM-Maps and mobile networks. Then click on the right one. SIM-map and find the switch Use VoLTE. If the slider is active, the icon should appear in the status bar if there is coverage.

If the switch is not in the standard menu, it may be hidden in the engineering menu or requires activation through system flags. Often, a simple reset of network settings or re-insertion helps. SIM-Make sure the phone has the latest version of the software from the manufacturer.

In some cases, the icon requires a special code in the engineering menu, but this is more relevant for older models or specific regions. For most users, standard settings in the mobile network section are enough.

⚠️ Warning: Don't try to change the settings in the engineering menu unless you're sure you're doing it. An erroneous radio configuration can cause the network to disappear completely.

Why the VoLTE icon may not appear or disappear

It's quite common for a feature to be enabled in settings but not on the icon. The first and most common reason is the lack of operator support in your current location. Even if you have 4G in a city, a particular tower may not be broadcasting voice packets.

The second reason lies in the settings themselves. SIM-Old cards issued several years ago may not have a VoLTE profile, and you should contact the phone for a free replacement. SIM-new card with support 4G.

Also, the badge can go missing when roaming. Many operators turn off voice transmission through the Internet. LTE overseas by default to avoid unnecessary costs. check your data roaming and voice calls settings in the menu SIM-map.

And software failures, too, are sometimes reset by Xiaomi's system update, which is when you reset your device or reset your network to factory values.

Differences between VoLTE, VoWiFi and Common Calls

Users often confuse voice technologies as synonymous: VoLTE uses a cellular operator network (4G base stations), while VoWiFi (Wi-Fi Calling) transmits voice over any available Wi-Fi connection, which are fundamentally different ways of delivering a signal.

Wi-Fi Calling technology is ideal for rooms with poor cell phone signal but good internet, and if you're in a basement or a country house where the phone catches 1-2 divisions, but there's Wi-Fi, the call will go through Wi-Fi Calling, and the icon will be different from VoLTE.

The key difference is that VoLTE only works in the 4G confident reception zone, whereas Wi-Fi Calling saves where cellular connectivity is completely absent.On Xiaomi smartphones, VoLTE is usually given priority if both options are available.

Both technologies use batch data, but routing is different. Operators see a Wi-Fi call as normal, so the cost of a minute remains the same as when talking through a base station.

Impact of technology on battery consumption and traffic

There is a myth that VoLTE puts a lot of battery on the ground, and in practice, the opposite is true: since the phone doesn't have to jump between 3G and 4G, the power consumption of the radio module decreases, but in areas of very weak 4G signal, the phone can spend more energy on holding the connection.

In terms of traffic, HD voice is consuming about 1-2 MB per minute, which is negligible by today's standards, and telecom operators tend not to subtract that volume from the main Internet package, but to count it as a normal conversation minute.

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If you want to know exactly how much traffic is going to VoLTE, turn on the traffic counter for the system process “IMS” or “Telephony” in the data usage settings.

On Poco and Redmi devices with large screens and powerful processors, the impact of the technology on overall battery life is almost imperceptible.

If you notice that the phone started to run out faster after the icon appeared, try switching the network mode to Preferably 3G for a couple of hours. If the discharge stops, then the problem is the poor 4G coverage in your area, not the technology itself.

Problem Solving and Network Diagnostics

If the icon is on, but the calls are not going through or are broken, you need to do a diagnostic. First, check if the Internet is running at high speed. If 4G is not working, then VoLTE will not work. Try to turn on and off flight mode.

Often the problem is solved by manually configuring access points. APN. Go to the settings. SIM-maps, select Access Points (APN) And reset them to the default settings, and the operator will prescribe the correct settings for multimedia services and voice.

⚠️ Note: When you reset your network settings, your stored Wi-Fi passwords and Bluetooth pairs will be deleted. Make sure you remember the data to connect to your home network.

In rare cases, you need to flash the radio module or update the basic version of the software. For Xiaomi users, the problem of regional restrictions is relevant: on Chinese versions of global firmware, some functions can be trimmed, in which case, changing the region in the phone settings helps.

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Stable operation of VoLTE depends on complex compliance: current firmware, new SIM-map and support from the operator in a specific location.

Frequently Asked Questions (FAQ)