VoLTE on Xiaomi Redmi 9T: why you need it, how to activate and fix bugs

If you own Xiaomi Redmi 9T and notice a mysterious VoLTE switch in your mobile network settings, but you do not understand why you need it, this article is for you. Voice over LTE technology (voice over 4G) radically changes the quality of calls, but many users either do not know about its existence or are afraid to turn it on because of possible problems. We will understand how VoLTE on Redmi 9T works with Russian operators in 2026, what pros and cons of this feature, and why it should (or should not) be activated.

The Redmi 9T supports VoLTE out of the box, but by default, the feature is often disabled - either by the operator or by the MIUI settings. As a result, you can use the phone for years without knowing that calls could sound much cleaner and the connection can be installed instantly. In this article, you will find not only theory, but also a step-by-step photo instruction on how to turn VoLTE on the Redmi 9T, as well as ways to solve typical problems - from the absence of an icon in the status bar to crashes when calling.

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

VoLTE (Voice over LTE) is a fourth-generation (4G) voice technology, not the older 2G/3G that used to be, but the main difference is that your voice is converted into digital data packets and transmitted over the Internet, like messengers like WhatsApp or Telegram, but unlike them, VoLTE works directly through the SIM card and does not require the installation of additional applications.

For Xiaomi Redmi 9T, VoLTE support means:

• 📞 Instant connection – the call is set for 1–2 seconds against 5–10 second-in-second 2G/3G).
• 🎤 Pure sound - wide band of frequencies (HD-voice makes the conversation natural, without noise.
• 📶 Stable signal – even in areas with weak coverage 4G The bell won't stop.
• 📱 Parallel Internet – during a conversation, you can use mobile Internet at full speed.

Without VoLTE, your Redmi 9T automatically switches to 3G or even 2G when you call, resulting in:

• ⏳ Delays in connection (sometimes up to 10-15 seconds).
• 🔇 Wheezing, interference and “robotizing” voice.
• 🚫 Internet loss during a conversation (if not enabled) 4G+ or LTE+).

Does VoLTE support your Xiaomi Redmi 9T?

All Xiaomi Redmi 9T models (including versions with different memory capacity) hardware support VoLTE, but there are a few nuances:

1. Regional firmware: If your phone is purchased in China (the domestic version), VoLTE can be blocked at the software level (MIUI Global or MIUI EEU) function.
2. Telecom operator: Not all Russian operators support VoLTE at all tariffs, for example, MTS and Beeline are actively implementing the technology, and Tele2 and Iota may restrict it for some regions.
3. MIUI version: In older firmware versions (below MIUI 12), VoLTE might not work smoothly. Upgrade the phone to the latest version.

To check for VoLTE support on your Redmi 9T:

1. Open Settings → About the phone → All the characteristics.
2. Find the line VoLTE Support or LTE-voice.
3. If you don’t have one, check the phone model in Settings → About Phone → Model. For the Redmi 9T, it should start with the M2010J19SG (global version) or M2010J19SC (China).

How to enable VoLTE on Xiaomi Redmi 9T: step-by-step instructions

Activating VoLTE on the Redmi 9T takes less than a minute, but requires the right sequence of actions.

1. Step 1. Check it out. SIM-VoLTE only works with nano-SIM operators that support the technology, ask your operator if the feature is available on your tariff, for example, MTS VoLTE is turned on by default on the rates "All!" and "Ultra", and Beeline - on "All is possible" and "No Limit".
2. Step 2. Activate mobile data Go to Settings → SIM-maps and mobile networks → Mobile Internet and enable data transfer to SIM-The card on which you want to use VoLTE.
3. Step 3. Enable VoLTE in Settings Open Settings → SIM-maps and mobile networks → [Choose. SIM-map] → Turn on VoLTE. The switch should turn blue.
4. Step 4: Reboot the phone After VoLTE activation, it is recommended to restart the Redmi 9T so that the changes take effect.

If you turn on the status bar next to the network indicator, you see the word "Volte" or "HD" on the function, and if not, go to the section "Why VoLTE does not work on Redmi 9T".

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If you don’t have “VoLTE” in your settings, try entering the ##4636### code in the phone app, go to “Phone Information” and select “VoLTE provisioned” in the drop-down menu.

How to turn off VoLTE on Xiaomi Redmi 9T

Despite the benefits, some users prefer to disable VoLTE. The reasons may be different:

• 🔋 Increased battery consumption (5-10% faster than discharge due to active 4G-module).
• 📶 Poor coverage 4G In your area (calls will be cut off more often than in your area) 3G).
• 💰 Additional fee (some operators charge VoLTE calls as Internet traffic).

To deactivate VoLTE:

1. Go to Settings. → SIM-maps and mobile networks → [Choose. SIM-map].
2. Turn off the VoLTE switch (it will turn gray).
3. Restart your phone to apply the changes.

⚠️ Warning: After the VoLTE shutdown, calls will go through 3G/2G, a while talking, the mobile Internet may be temporarily disconnected (unless you have activated) 4G+).

Why VoLTE doesn’t work on Xiaomi Redmi 9T: Reasons and Solutions

If the icon does not appear in the settings after turning on VoLTE, and calls are still going through 3G, the problem may lie in one of the following factors:

If none of these methods worked, try resetting your network settings:

1. Go to Settings → System and device → Resetting of settings → Resetting of mobile network settings.
2. Confirm the action and restart the phone.
3. After restarting, re-enable VoLTE.

⚠️ Attention: Network reset will delete all stored Wi-Fi passwords and associated Bluetooth devices.

VoLTE vs Wi-Fi Calling on Xiaomi Redmi 9T: Which is better?

In addition to VoLTE, Redmi 9T has another technology for improving call quality, Wi-Fi Calling, which allows you to call over Wi-Fi when the mobile network is not available, but how do these features differ, and which one to choose?

When to use VoLTE:

• 🏙️ You are in a city with good coverage. 4G.
• 📞 You want maximum sound quality.
• 🌍 You travel frequently (VoLTE roams most operators).

When to choose Wi-Fi Calling:

• 🏡 You are at home or in an office with stable Wi-Fi.
• 📶 There's a weak signal in your area. 4G.
• 🔋 You need to save battery power.

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VoLTE and Wi-Fi Calling can be used simultaneously on the Redmi 9T. The phone will automatically choose the best option depending on the available networks.

Secret codes for VoLTE diagnostics on Xiaomi Redmi 9T

If you want to check whether VoLTE is working correctly on your Redmi 9T, you can use engineering codes to help you know the current status of the feature and diagnose problems.

Enter the following codes in the standard Phone app:

• #4636## - Opens the test menu. Go to Phone Information and check the VoLTE provisioned bar (should be 1).
• ##2263## shows bandwidth information. If VoLTE is active, you'll see the LTE Band on the call.
• *#0011# - displays the modem status. During a VoLTE call, the log must display IMS Registration records.

⚠️ Warning: Do not change the settings in the engineering menu unless you are sure of their purpose.

If you enter the code ##4636### and see VoLTE provisioned:0, it means that the function is locked at the operator or firmware level.

1. Call your carrier support and check if VoLTE is available for your number.
2. If the operator confirms support, but VoLTE does not work, update the firmware or install MIUI EEU.

FAQ: Frequent questions about VoLTE on Xiaomi Redmi 9T