VoLTE on Xiaomi: what it is and how to set up HD-call-up

Xiaomi smartphone owners often notice VoLTE icons in the status bar, but not everyone understands why they need it and how it affects communication quality. This technology has become the standard for modern 4G networks, allowing voice to be transmitted as a data stream, not as a regular phone call. If you want conversations to be crystal clear and the Internet does not switch to 3G during communication, you need to understand the settings of this feature.

Many users experience a badge that goes missing or calls are disrupted by switching to EDGE. In this article, we will explain in detail what is behind the acronym Voice over LTE, why it is critical for Redmi and Poco, and how to force it to activate if the operator does not provide the service automatically.

Modern Xiaomi smartphones, working on the basis MIUI HyperOS, or HyperOS, has powerful modems that can maintain high communication standards, but software limitations or incorrect settings. SIM-The cards can block the advanced functions. IMS-Profile will help you avoid communication problems in the future.

VoLTE Technology: How it Works

Traditional cellular communications use circuit switching, where voice is allocated a separate frequency. Voice over LTE technology is a radical change in the way voice packets are transmitted through a fourth-generation network, just like any Internet traffic, which allows you to free up frequencies for other users and significantly increase the bandwidth of the network as a whole.

For a Xiaomi smartphone, this means that during a conversation, the device will not “roll back” to slower 2G or 3G networks. You can simultaneously talk on the phone and download files at a top speed of 4G. The sound quality increases to HD, becoming richer and more natural than using old coding standards.

However, for stable operation, support from three components is required: your operator, SIM-If at least one element of the circuit is not configured correctly, the function will not be activated. In Xiaomi smartphones, a special software module is responsible for this, which is integrated into the system settings of the radio module.

⚠️ Note: If your plan does not include VoLTE support, activating the feature in the phone settings will not work.

Benefits of using HD-call-up

The switch to VoLTE has tangible benefits in everyday smartphone use, primarily in terms of audio quality: the person is heard as if they were in the same room with you, noise cancellation is more efficient, and voice delays are virtually eliminated due to low LTE ping.

The second big thing is the speed of the connection, which is that dialing and connecting is almost instantaneous, without the kind of wait beep we're used to hearing on old networks, which is especially important for business people who value every second.

In addition, the use of VoLTE has a positive effect on battery autonomy: a smartphone does not need to constantly switch between 4G and 3G modes, which is an energy-intensive process for a radio module.

• 📶 Simultaneous work 4G Internet and voice communication without interruption.
• 🔊 Improved sound quality (HD Voice) with extended frequency range.
• ⚡ Instant connection with the subscriber (Fast Connect).
• 🔋 Reducing the power consumption of the modem due to the absence of constant reconnections.

Checking of operator support and tariff

Before you go into the engineering menu or hidden settings, make sure your mobile operator provides VoLTE service in your area. Major Russian operators such as MTS, Beeline, MegaFon and Tele2 have already implemented this technology, but coverage may vary depending on the area.

It often happens that the service is enabled by default, but on the old SIM-If you're using a SIM card that was released a few years ago, it makes sense to replace it in the salon with a new one that supports it. USIM. It is a free process that often solves problems with online registration. 4G.

You can check the status of the connection through the operator’s personal application or by sending USSD-Each provider has a code to activate the service, for example, for some operators it can be an activation command in the service menu, without a confirmed service on the network side, the phone's settings will be useless.

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Replace the old one. SIM-a new card in the operator's cabin, if you use it more 3-4 New chips work better with modern communication standards 4G and 5G.

Activation of VoLTE in standard settings Xiaomi

In most cases, Xiaomi smartphones automatically pick up the operator's settings. SIM-The VoLTE icon must appear on its own, but sometimes you need to manually enable it in the menu.

Find the item associated with using a 4G network. In some versions of MIUI, the VoLTE switch is hidden inside the network type selection menu. You need to choose your preferred network type Prefer LTE or 5G/LTE/3G/2G. After selecting this item, an additional "Use VoLTE" switch may appear below.

If the switch is active but the icon is not on, try restarting the device. Sometimes the IMS profile does not load when you first turn on the phone, and also helps short-term flight mode, which causes the modem to re-register on the network.

Hidden activation via the engineering menu

There are situations when the operator supports the technology, the tariff allows, but the Xiaomi menu switch is missing or inactive. SIM-So, you can use different carrier maps or global firmware versions, and then you can use the engineering menu to help you.

To log in, open the Phone app and dial the code ##4636##. If the code didn't work, your shell version may be blocking access, so you can use the Activity Launcher app from Google Play by finding com.android.settings activity and selecting Testing.

In the menu that opens, select Phone Information. Scroll down to Set up VoLTE Switch or Set Preferred Network Type. You can force IMS support here. Be careful, changing the radio settings may temporarily disrupt communication.

⚠️ Warning: Do not change the settings of "Set Preferred Network Type" at random. Select the wrong mode (for example, LTE Only) may result in a complete absence of incoming calls, as the network 2G/3G for voice communication will be disabled.

Once you have enabled the hidden options, go back to your normal settings and check if the icon appears. If the HD or VoLTE icon catches fire, it is a success, and in some cases, you need to restart the device to apply the changes.

Compatibility and status table

It can be difficult to figure out the connection statuses. Below is a table that will help diagnose your network status. Statuses can vary depending on the Android version and smartphone model.

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If the VoLTE icon appears on only one SIM-If you want to change the slots, sometimes one of the slots takes priority for voice services.

Frequent problems and their solution

One common problem is that the icon disappears after a firmware update. Updating HyperOS or a new version of MIUI can reset the operator's configuration files, in which case manually entering APN settings helps, although for VoLTE it is often the IMS profile that is updated automatically that is important.

And users are also experiencing the Internet shut down during the call, which is a sure sign that VoLTE is not working and the phone is switching to 3G for voice, where simultaneous data and voice transmission is impossible (without DCS technology), and the solution is to activate Voice over LTE.

If nothing works, you can try resetting the network settings, which will return all modem parameters to factory values by removing stored Wi-Fi passwords and Bluetooth pairings, but often resolve conflicts in the operation of the radio module.

⚠️ Note: Resetting network settings will delete all stored Wi-Fi and Bluetooth pairing passwords.Make sure to remember passwords from important networks before performing this operation.

Impact on Internet speed and gaming

For mobile gamers, VoLTE is a critical feature. In games like PUBG Mobile or Call of Duty Mobile, where a constant connection is required, switching to 3G during an incoming call often resulted in a disconnection of the connection with the server (“Connection Lost”).

With VoLTE enabled, the call arrives as a normal notification without interrupting gameplay. You can answer the call, discuss with, and the game will continue to run in the background without losing data packets.

This makes the technology a must for active audiences using smartphones not only for communication but also for entertainment, and the stability of the connection directly affects the outcome in online matches.

• 🎮 No connection breaks in online games when an incoming call.
• 📉 Stable ping without surges of delay during conversation.
• 📲 The ability to use the navigator and messengers in parallel with a voice call.