VoLTE in Xiaomi Redmi 9: why you need it, how to turn on and fix problems

Have you ever noticed that while you're on the phone, the Internet suddenly disappears, and after the call is over, the browser page is updated with a delay? Or that the voice of the interlocutor sounds like he's talking from a barrel? Chances are, your Xiaomi Redmi 9 doesn't use VoLTE technology — it's a waste. This feature, which at first glance seems like a trifle, actually changes the quality of mobile communication.

In this article, we will discuss what is VoLTE in the context of Redmi. 9, Why operators are actively switching to this standard, and how to include it (or why it may not work).2, — And there are also common bugs that cause VoLTE to refuse to activate, if you're still calling the old-fashioned way through the Internet. 2G/3G, After reading this, you will realize what you have lost.

What is VoLTE and why is it important for Xiaomi Redmi 9?

VoLTE (Voice over LTE) — It's a fourth-generation voice technology (4G LTE). Unlike traditional calls that use legacy networks. 2G or 3G, VoLTE sends voice data as packets over the Internet protocol, just like any other traffic, and this has three key benefits:

• 📞 Sound quality: Voice is transmitted in format HD Voice (broadband audio codec), which removes background noise and makes the sound more natural - as if the interlocutor is next to you.
• ⚡ Connection speed: The call connects almost instantly (because of the 1–2 second-on 5–10 second-in-second 2G/3G).
• 🌐 Continuous Internet: During the conversation, the connection with the Internet is not interrupted 4G, You can talk and use the mobile Internet at the same time (for example, Google information or view maps).

For Xiaomi Redmi 9 Support for VoLTE is critical because many operators (including in Russia) actively shut down networks. 2G/3G favorably 4G/5G. Without VoLTE, your smartphone risks being left without the ability to call at all — or will be forced to switch to legacy networks with poor coverage.

Technically Redmi 9 (model) M2003J15SC For global markets, it supports VoLTE out of the box, but it can be disabled by default, and it depends on the firmware, SIM-maps and operator settings. more about this in the next section.

How to check if your Redmi 9 VoLTE is supported

Before you set up VoLTE, make sure your Xiaomi Redmi 9 is capable of using it at all. Here are three ways to check:

1. Verification of the smartphone model: VoLTE supports all versions of Redmi 9, including: 📱 Redmi 9 (codename lancelot, model M2003J15SS for India, M2003J15SC global-market) 📱 Redmi 9 Prime (M2004J19PI) 📱 Redmi 9A/9C/9T (VoLTE support depends on regional firmware)

You can find out the exact model in the settings → The phone. → Model.

Firmware check

MIUI 11 and newer

Settings → About the phone → System update

Verification SIM-map

nano-SIM

VoLTE

If all three conditions are met, but VoLTE doesn't work, the problem is the settings.

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Before setting up VoLTE, make sure you have mobile internet enabled (4G). No active LTE-The function will not work even if it is activated in the menu.

Step-by-step: how to turn on VoLTE on Xiaomi Redmi 9

Activation of VoLTE on Redmi 9 takes less than a minute, but the path to settings may vary depending on the version. MIUI. Follow the instructions for your firmware:

Method 1: Through “Settings» (MIUI 12/13/14)

Open the Settings. → SIM-maps and mobile networks|

Choose yours. SIM-card (if two of them)|

Tap Enable VoLTE (or Voice Calls) 4G)|

Restart your phone (required!)|

Check the VoLTE indicator in the status bar (Icon) HD or VoLTE near the signal level)

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If the VoLTE item is not on the menu, it means:

• 🔄 Your firmware is outdated (update it).
• 📶 The operator does not support VoLTE for your tariff (check on the operator's website).
• 🛠️ The function is hidden in the engineering menu (see Method 2).

Method 2: Through the engineering menu (if there is no item in the settings)

If VoLTE is not available in the standard settings, you can turn it on via a hidden menu.

1. Open the phone app and enter the combination: ##4636##
2. Select Phone Information (or Phone Information).
3. Scroll down to Set preferred network type.
4. Select LTE only or LTE/WCDMA/GSM auto.
5. Go back and find the VoLTE provisioned option – it should be Enabled.
6. Reboot the phone.

If after these actions, VoLTE did not work, the problem may be in the IMEI Or operator settings. That's what's in the troubleshooting section.

VoLTE and telecom operators: what you need to know owners of Redmi 9

Even if your Redmi 9 supports VoLTE, the feature won’t work until your mobile operator activates it. In Russia, the situation with VoLTE looks like this (data for 2026):

If you are using Redmi 9 with two SIM-maps, take note:

• 🔄 VoLTE will only work on the main SIM-card (the one selected for the default calls).
• 📵 Second. SIM-The VoLTE card will be disabled even if it is the same operator.
• 🔧 To change priority SIM-map for VoLTE, go to Settings → SIM-maps and mobile networks → Choice SIM-call-card.

⚠️ Note: If you are traveling abroad and using local SIM-card, VoLTE may not work due to roaming.Many foreign operators block VoLTE for roaming subscribers.

Common VoLTE issues on Redmi 9 and their solutions

VoLTE on Xiaomi Redmi 9 is usually stable, but sometimes users encounter bugs.

Problem 1: VoLTE is not turned on (grey switch)

If the VoLTE option is inactive (grey) in the settings, the reasons may be:

• 🔌 No network. 4G: VoLTE only works when connected to the LTE. Check if the mobile Internet is turned on and if the phone catches the network 4G.
• 📱 Outdated firmware: Update MIUI Up to the latest version through Settings → The phone. → Updating the system.
• 🔧 Failure IMEI: If IMEI If it's dropped (for example, after firmware), VoLTE won't work. IMEI *#06# - if it is missing or incorrect, you need to restore (refer to the service center).

Problem 2: VoLTE is turned on, but calls are broken

If the call connects but stops after a few seconds, try:

• 🔄 Switch the network: Manually select the mode Only LTE In Settings → SIM-maps and mobile networks → Preferred type of network.
• 📶 Change the access point (APN): Remove the current one. APN Create a new one with your operator’s settings (you can find them on the official website).
• 🔋 Reset network settings: Go to Settings → System system → Resetting settings → Resetting mobile network settings.

Problem 3: No VoLTE icon, but calls go through 4G

Some firmware MIUI do not display the indicator HD Or VoLTE in the status bar, although the technology works, to make sure the call is on VoLTE:

1. During the conversation, open the notification panel.
2. Look at the network icon: if it stayed 4G (I didn't switch to 3G or+), So, it's using VoLTE.
3. Call another phone with VoLTE – if the connection is instant and the sound is clear, the technology works.

⚠️ Warning: If after turning on VoLTE you notice that the battery starts to go down faster, that's OK. 4G-modem is more active than 2G/3G. To save charge, turn off VoLTE when it isn't needed (e.g. at night).

VoLTE vs Wi-Fi Calling: Which is the best for Redmi 9?

Along with VoLTE, Xiaomi Redmi 9 has another technology for improving the quality of calls — Wi-Fi Calling.

When should I use Wi-Fi Calling instead of VoLTE?

• 🏠 You are in a bad coverage area. 4G, There is good Wi-Fi (for example, in the basement or outside the city).
• 🌍 You're roaming and VoLTE is disabled by the operator.
• 🔋 You need to save battery power (Wi-Fi consumes less energy than you do). 4G).

To enable Wi-Fi Calling on Redmi 9:

1. Go to Settings → SIM-cards and mobile networks.
2. Choose yours. SIM-map.
3. Activate the Call Switch over Wi-Fi.
4. If necessary, enter the emergency call address (usually requested on the first connection).

Please note that Wi-Fi Calling and VoLTE can be used simultaneously. 4G The phone will automatically switch to Wi-Fi (and vice versa).

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If you have problems with call quality, try VoLTE first. 4G Weak — go to Wi-Fi Calling, ideally configure both technologies for maximum stability.

The future of VoLTE: is it worth waiting for the shutdown 2G/3G And how that will affect Redmi. 9

Many operators around the world have already started to shut down networks. 2G and 3G, to free up the frequencies for 4G and 5G. In Russia, this process is slower, but the trend is obvious:

• 📉 MTS plans to completely disconnect 2G 2026 (in some regions already disabled).
• 📉 Beeline and MegaFon cut coverage 3G, call-out 4G.
• 📉 Tele2's already offline. 3G most major cities.

What does this mean for Xiaomi Redmi 9 owners?

• ✅ If you have VoLTE on, nothing will change. 4G, as before.
• ❌ If the VoLTE is not supported (for example, due to the old one) SIM-cards or firmware, after disconnection 2G/3G You can't call at all -- the phone just won't find a voice network.
• 🔄 If you use Redmi 9 as a backup phone (for calls, for example), make sure it supports VoLTE, otherwise it will become useless after you turn off old networks.

How to Prepare for Shutdown 2G/3G:

1. Update the firmware to the latest version of MIUI.
2. Change it. SIM-card for a new (free in the operator’s cabin).
3. Check VoLTE beforehand – don’t wait for the networks to shut down.
4. If VoLTE doesn’t work, consider alternatives: Wi-Fi Calling or buying a new smartphone with support. 5G (For example, the Redmi Note 12).

⚠️ Note: Some gray versions of Redmi 9 (both imported from China or India) may not support VoLTE for Russian operators due to differences in frequency bands.

FAQ: Frequent questions about VoLTE on Xiaomi Redmi 9