How to turn on VoLTE on Xiaomi Redmi Note 4X: full instruction with compatibility check

Xiaomi Redmi Note 4X (codename mido is still a popular budget smartphone, but many users face a problem: operators turn off 2G/3G without VoLTE (voice through the network) 4G) In this article, we'll look at how to check your device's support for the technology, set it up correctly. SIM-map and turn on VoLTE – even if there is no corresponding switch in the menu.

It’s important to understand that VoLTE on the Redmi Note 4X doesn’t work with all firmware. The official global MIUI often blocks this feature, whereas custom firmware (like Pixel Experience or LineageOS) can unlock it. We’ll look at both options, from standard settings to manually enabled via the engineering menu.

If after all the manipulations VoLTE and did not work, at the end of the article you will find a table of compatibility with operators (MTS, Beeline, Tele2, Megaphone) and alternative solutions - from changing the firmware to using applications for IP-telephony.

1.Verify VoLTE support for your Redmi Note 4X

Before you try to turn on VoLTE, make sure your device and SIM-The map actually supports this technology. 4X There are two key limitations:

• 📱 Hardware Support: All versions of Redmi Note 4X (including mido with Snapdragon 625 processor technically capable of running VoLTE, but require proper firmware.
• 📶 Operator Compatibility: Not all Russian carriers support VoLTE on this device. for example, Tele2 officially does not include it for Xiaomi older than 2018.
• 🔄 Version. MIUI: In official assembly MIUI 9-12 VoLTE is often software disabled. On custom firmware (like Havoc-OS), the function is available out of the box".

To check the hardware support:

1. Install Network Signal Guru from Google Play.
2. Open the Device tab and find VoLTE Support, and if yes is there, the hardware supports the technology.
3. Check your current network: In the same app in the Signal tab, see if you’re connected to LTE (not 3G/2G).

Critical detail: even if VoLTE is supported, its operation depends on the IMS-For example, MegaFon requires that the settings SIM The option was activated "4G (recommended) or the calls will fall on 3G.

2. Preparation of SIM-card and network settings

A common mistake users make is to try to turn on VoLTE without setting up SIM properly. On the Redmi Note 4X, this is especially important, as the device is sensitive to card type and network priority.

First, follow these steps:

Make sure that the SIM supports 4G (nano-SIM released after 2017)

Insert the card in Slot 1 (on the Redmi Note 4X VoLTE works only in the first slot)

Go to Settings. → SIM-maps and mobile networks → [Yours. SIM] → Network type and select 4G (recommended)

Turn off and turn on the plane mode (network reset)

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If you have two. SIM-The card, VoLTE will only work on the one in Slot 1. This is a firmware restriction, you can only get around it by changing the software to custom.

Check it out. APN-setting:

1. Go to Settings. → SIM-maps and mobile networks → [Yours. SIM] → Access points (APN).
2. Select your operator’s APN (for example, for MTS it is Internet.mts.ru).
3. Make sure that the APN settings have the following lines: apn protocol = IPv4/IPv6 apn roaming protocol = IPv4/IPv6 If they are not, add manually.

⚠️ Attention: On some firmware MIUI post-edit APN Changes are not saved. In this case, reset the network settings: Settings → System system → Reset → Resetting Wi-Fi, Mobile Network and Bluetooth.

3. Enabling VoLTE through standard MIUI settings

If your firmware supports VoLTE, you can turn it on via the menu. On the Redmi Note 4X, the path depends on the version of MIUI:

For MIUI 10-12:

1. Open the Settings. → SIM-maps and mobile networks.
2. Choose yours. SIM-map (in Slot 1).
3. Turn on VoLTE (or 4G call).
4. Reboot the phone.

For MIUI 9 and older:

• The VoLTE option may not be available. In this case, try: Enter the code ##4636## in the phone app. Go to the Phone Information tab. Scroll down and find Enable VoLTE proxy (if you have an option, activate it).

If you don't have VoLTE on the menu, your firmware is blocking it.

• 🔄 Update. MIUI Up to the latest version (through Settings) → The phone. → Updating the system).
• 📱 Install custom firmware (for example, Pixel Experience – VoLTE works out of the box").
• 🛠️ Enable VoLTE through the Engineering Menu (instructions in the next section).

Step 2: Checking IMS-registration

• In the same engineering menu, go to the IMS Service Status tab.
• Make sure that the IMS Registered status (if Not Registered – VoLTE will not work) is not valid.

If the engineering menu doesn't open or VoLTE options aren't there, your firmware is hiding them, and then only a software change will help.

⚠️ Warning: Do not change other options in the engineering menu - this can lead to network loss or unstable modem operation. For example, changing Band Selection without knowing the operator's frequencies will make the smartphone "deaf".

5. compatibility of VoLTE with Russian operators

Even if you have properly configured VoLTE on the Redmi Note 4X, it depends on the operator’s policy, and the table below shows the current support data for 2026:

If your carrier doesn’t support VoLTE on the Redmi Note 4X, there are two options:

• 🔄 Change the operator (for example, MTS or Yota).
• 📞 Use alternatives: Wi-Fi Calling (if supported by the operator) Calling apps: WhatsApp, Telegram VoIP, Zoiper.

💡

On Tele2, VoLTE will not work under any settings - this is a limitation of the operator, not the phone.

6. Alternative methods: custom firmware and patches

If the standard methods don't work, the radical solution is to change the firmware. On the Redmi Note 4X, VoLTE is guaranteed to work on the following builds:

• 📱 Pixel Experience (Android 10/11) — VoLTE is included in the settings SIM.
• 📱 LineageOS 17.1+ — requires manual adjustment IMS.
• 📱 MIUI EU (unofficial European version – VoLTE works out of the box".