VoLTE in Xiaomi Redmi: why you need it, how to turn on and fix problems

Have you ever noticed that while talking on the phone, the Internet suddenly disappears and the quality of communication leaves much to be desired? Chances are, your Xiaomi Redmi does not use VoLTE technology, a standard that radically changes the approach to voice communication in the era of 4G/5G. This feature not only improves sound, but also solves the problem of “breaking” mobile Internet during calls.

In this article, we will explore what VoLTE is in practice, why support for it is critical for modern smartphones (especially the budget lines Redmi Note and Redmi), and why some Xiaomi users are faced with the fact that the option is either missing in the settings or is unstable.

Spoiler: Without VoLTE, your Redmi uses an outdated voice transfer method (CSFB), which is not only slower, but consumes the battery more actively. Now, in order.

What is VoLTE and why is it important for Xiaomi Redmi?

VoLTE (Voice over LTE) is a technology for voice calls over a 4G LTE network, rather than through traditional 2G/3G channels, as was previously done, with the main advantage of being digitally transmitted (AMR-WB or EVS codecs), which provides twice as clear a sound as conventional calls – without noise, echoes or interruptions.

For owners of Xiaomi Redmi (especially Redmi Note 10/11/12, Redmi 9/10) VoLTE is important for two reasons:

• 📶 Without a cliff of the Internet: with a normal call, the smartphone switches from 4G on 3G/2G, And that's why mobile traffic stops. VoLTE doesn't -- you can talk and you can use the Internet at the same time.
• 🔋 Battery savings: Switching between networks (CSFB) VoLTE runs consistently on the same network, reducing the load on the processor.
• ⚡ Fast connection: VoLTE calls are set in 1-2 seconds (versus 3-5 seconds at the time of the call). CSFB).

However, there is a caveat: not all operators in Russia and the CIS fully support VoLTE, and some Redmi models (especially those released before 2020) may require manual activation of the feature.

How to find out if your Xiaomi Redmi VoLTE supports

Before you set up VoLTE, check if your smartphone supports it and SIM-Here's 3 ways:

1. Model check: Most Redmis since 2018 (e.g. Redmi Note 7, Redmi 8 and later) support VoLTE at the hardware level. Exceptions are some versions for specific regions (e.g. Indian models may not work in Russia). The full list of compatible devices is available on the official Xiaomi website.
2. Phone Settings: Go to Settings → SIM-maps and mobile networks → [choose SIM] → Enable VoLTE. If no option is available, either the model does not support the function or you need a software update.
3. USSD Code: Dial ##4636##, then go to Phone Information. Set preferred network type should have LTE/VoLTE.

If VoLTE is not in the settings, but the model should support it, the problem may be:

• 📱 An outdated version MIUI (firmware update).
• 📡 Unsupported operator (list below).
• 🛠️ Customized firmware (e.g. LineageOS or Pixel Experience may require manual tuning).

Step-by-step: how to turn on VoLTE on Xiaomi Redmi

If your smartphone and carrier support VoLTE, you can activate it in 2 minutes:

1. Open the Settings. → SIM-maps and mobile networks.
2. Choose yours. SIM-card (if there are several).
3. Find Enable VoLTE (or Voice Calls over LTE) and activate the slider.
4. Reboot your phone (required!).

When turned on, an HD, VoLTE or 4G+ icon should appear next to the network indicator during the call.

SIM card supports USIM (not outdated)

The operator officially supports VoLTE in your region

In the network settings, the mode “4G (preferably)” or “LTE” is selected.

The phone has been updated to the latest version of MIUI

No active VPN or "Flight" mode"-->

If VoLTE never came up, try resetting your network settings:

Settings → System → Resetting → Reset settings Wi-Fi, mobile network and Bluetooth

⚠️ Note: On some firmware (e.g. Xiaomi.EU), VoLTE may require manual configuration via the engineering menu. dial ##86583## and select VoLTE Provisioning. Do not change other options in this menu - this may disrupt the network!

VoLTE vs Wi-Fi Calling: What’s Best for Xiaomi Redmi

Along with VoLTE, Redmi has another advanced call technology called Wi-Fi Calling (or VoWiFi), which allows you to call over Wi-Fi if the mobile network is weak. But which one?

Bottom Line: VoLTE is preferred by most Redmi users because it is more stable and does not depend on Wi-Fi. Wi-Fi Calling is useful in areas with poor coverage (for example, in the basement or outside the city), but can cause sound delays.

💡

If you have a weak 4G signal but have good Wi-Fi, turn on both modes (VoLTE + Wi-Fi Calling).

VoLTE problems on Xiaomi Redmi and their solutions

Even if VoLTE is enabled, Redmi users sometimes encounter bugs, and here are the most common ways to fix them:

1. VoLTE is enabled but not working (no HD icon)

Reasons:

• 📵 The operator has not activated the service for your number (call for support).
• 🔄 In the network settings selected mode Only 3G (swap for 4G).
• 📦 An outdated version MIUI (Update through Settings → The phone. → Updating the system).

2. Calls are interrupted or the sound is interrupted

This is most often related to:

• 📡 Bad signal. 4G (Check the coverage of the operator in your area).
• 🔋 Battery savings (turn off Ultrasaving mode in battery settings).
• 🛠️ Application conflict (e.g. DualSpace or Second Space can block VoLTE).

3 VoLTE is missing after MIUI update

This is a well-known problem with some firmware.

1. Reset your network settings (see instructions above).
2. Install custom TWRP recovery and run the VoLTE fix module (for advanced users).
3. Reverse to previous version of MIUI (if the update was recent).

⚠️ Note: Some Redmi models (e.g. Redmi Note) 8 Pro after updating to MIUI 13/14 VoLTE may disappear from settings.This is a Xiaomi bug - watch for patches in the official Telegram update channel.

VoLTE on custom firmware (LineageOS, Pixel Experience)

If you're using unofficial firmware on your Redmi, VoLTE may not work out of the box.

1. Make sure the firmware supports VoLTE (check out the XDA Developers forum for your model).
2. Set the right ones IMS-modules via Magisk (e.g. module) IMS Fix for Xiaomi).
3. Manually prescribe operator settings in the file /data/vendor/radio/ims_config.xml (Root rights are required).

Example of lines ims_config.xml (for MTS):

<item name="carrier_volte_enabled" value="true" />


<item name="carrier_vt_enabled" value="true" />




<item name="carrier_wfc_enabled" value="true" />

After the changes, restart your phone and check VoLTE through the engineering menu (#4636###).

💡

On custom firmware, VoLTE often requires manual tuning IMS-Without root rights, it's almost impossible to activate it.

The future of VoLTE: what awaits owners Xiaomi Redmi

Starting in 2026, operators around the world are starting to shut down 2G/3G networks, switching to 4G/5G.

• 📞 Calls without VoLTE will be impossible (technology) CSFB demand 3G voice-over).
• 📱 Smartphones without VoLTE support (e.g. Redmi) 4X, Redmi 5A) They'll lose the chance to call.
• ⚡ Operators will be forced to activate VoLTE for all subscribers (already happening at MTS).

For Xiaomi Redmi owners, this means:

• 🔄 If your phone is released before 2018, you will probably have to change it.
• 📲 On models 2019–2026 (Redmi Note) 10/11/12, Redmi 9/10/11) VoLTE is already supported, but may require an update.
• 🌍 VoLTE may not work in roaming – check with the operator.

Xiaomi has already announced that all new smartphones (starting with the Redmi 13C) will support VoNR (voice calls over 5G), but this will require updating carrier networks.

FAQ: Frequent questions about VoLTE on Xiaomi Redmi