How to turn VoLTE on Xiaomi Redmi 4X: proven ways of 2026

The Xiaomi Redmi 4X is one of the most popular budget smartphones of 2017, and is still in active use. However, many owners are facing a problem: VoLTE (voice over 4G) on this device is often disabled by default or unstable. What is the reason? The Redmi 4X originally came with outdated MIUI 8/9 firmware, where VoLTE support was limited or required manual activation.

Today we will analyze all working ways to enable VoLTE on Xiaomi Redmi 4X, including SIM-It's important to understand that successful activation depends not only on your smartphone, but also on your carrier — not all providers support this technology in 2026. HD-- No noise or breaks, then let's get started!

What is VoLTE and why it is not on Redmi 4X

VoLTE (Voice over LTE) is a technology that allows voice calls to be made over a 4G network, rather than switching to 2G/3G as is usual.

• 📞 Instant connection – the call starts faster, without delay.
• 🔊 Better sound quality – wide bandwidth provides HD-voice.
• 📶 Communication stability – no “failures” when switching between networks.
• 📱 Parallel Internet – you can use mobile Internet during a conversation.

So why doesn't Redmi 4X support VoLTE out of the box?

1. Outdated firmware. Stock MIUI 8/9 is not optimized for modern communication standards.
2. Some versions of the Redmi 4X (e.g. for China) are not certified for VoLTE in Russia and CIS.
3. Operator lock, even if your smartphone supports VoLTE, your tariff or SIM-The card may not be activated.

Fortunately, most of these problems are solvable. Next, we’ll look at 4 proven ways to enable VoLTE on the Xiaomi Redmi 4X, from the simplest to the most advanced.

Method 1: Enabling VoLTE through standard MIUI settings

The first and easiest method is to activate VoLTE through the settings menu, and it works if:

• 📱 You're set. MIUI 10 or newer.
• 📶 Your operator officially supports VoLTE (list below).
• 🔄 SIM-map activated for 4G-Calls (sometimes a replacement is required) USIM).

Instructions:

1. Open the Settings. → SIM-maps and mobile networks.
2. Choose yours. SIM-card (if two of them).
3. Tap on the network type.
4. Turn on the VoLTE switch (or Improved Calls).
5. Reboot your smartphone.

If VoLTE is not on the menu, your firmware does not support this out of the box function, in which case you can move to Method 2 or 3.

List of operators supporting VoLTE in 2026 (Russia/CIS):

⚠️ Warning: If after turning on VoLTE calls began to be interrupted or the Internet disappeared, turn off the function and check the settings APN. Your operator may require manual configuration of access points.

Method 2: Activate VoLTE through the Engineering Menu (for advanced)

If VoLTE is not available in standard settings, you can turn it on via an engineering menu (also known as MTK Engineering Mode), which works on Redmi 4X with a Snapdragon 435 processor and requires caution – wrong actions can disrupt network performance.

Step-by-step:

1. Open the phone app and enter the combination: ##4636##
2. In the menu that opens, select Phone Information (or Phone Information).
3. Scroll down to the Set preferred network type section.
4. Select LTE only or LTE/UMTS auto.
5. Go back and find the VoLTE provisioned item – turn it on.
6. Reset the device.

If the #4636### combination doesn’t work, try the alternative code for Xiaomi:

##86583##

It opens the VoLTE Test menu where you can manually activate the function.

⚠️ Warning: Changing the settings in the engineering menu can lead to network loss or incorrect operation SIM-Before experimenting, save a backup copy through Settings → Additionally. → Backup.

Method 3: Update the firmware to MIUI 12+ (guaranteed method)

The only reliable way to get VoLTE to work on the Redmi 4X is to upgrade to MIUI 11 or later. In older versions (MIUI 8/9), VoLTE is either missing or implemented with errors. Official updates for the Redmi 4X stopped in 2020, but there are two options:

1. Install custom firmware (such as LineageOS or Pixel Experience).
2. Manually flash the latest official MIUI via Fastboot.

Instructions for updating via Fastboot:

1. Download the latest official firmware for Redmi 4X (codename santoni).
2. Unpack the archive in a folder on your computer.
3. Install ADB and Fastboot.
4. Connect your phone to your PC in Fastboot mode (clip Volume Down + Power when turned on).
5. Open the command line in the firmware folder and execute: fastboot flash all (without specifying the file name, the script will automatically find the necessary components).
6. Upon completion, type in fastboot reboot

After the update, check for VoLTE in Settings → SIM-map → Network type. If you have an option, activate it and restart the device.

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Before you run the firmware, check the bootloader version through the fastboot getvar anti command. If locked, unlock it through the official Xiaomi tool.

Method 4: Replacement SIM-card USIM (if nothing helps)

If all previous methods have failed, the problem may be SIM-VoLTE is required to operate. USIM-card, not the usual SIM), which supports data transmission over a protocol IMS. How to check and replace:

• 🔍 Look at the map itself: if it is written on it USIM or 4G LTE — It fits.
• 📞 Call the operator and check if you have activated the service VoLTE. For example, MTS does this through the Internet. USSD-team *111*555#.
• 🔄 If the card is old (issued before 2018), visit the operator’s salon and ask to replace it with a new one. USIM free-for-free.

After replacement SIM-map:

1. Reboot the phone.
2. Turn on Flight Mode for 30 seconds, then turn it off.
3. Check for an HD or VoLTE icon in the status bar at the time of the call.

⚠️ Note: Some operators (e.g. Tele2) link VoLTE to a specific service SIM-If you have replaced a number or card, you may need to reactivate through support.

Frequent problems and their solutions

Even after successful activation of VoLTE, Redmi 4X users are faced with typical errors, and we will discuss the most common and ways to fix them:

If none of these methods worked, there are two options:

1. Install custom firmware with full VoLTE support (e.g. Havoc-OS or crDroid).
2. Buy an external VoLTE adapter (e.g. Xiaomi Mi VoLTE Enabler, but it is not suitable for all models).

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Before installing custom firmware, make sure it is compatible with your Redmi 4X codename, santoni. The mismatch will lead to a device blink!

FAQ: Answers to popular questions