Voice calls over the Internet on Xiaomi: how to turn on VoLTE and VoWiFi in 5 minutes

Why are voice calls over the Internet better than normal?

Have you ever noticed how when you're talking on the phone, suddenly, you lose your connection in the subway or on the outskirts of the city? Or how your voice turns into a robot because of a bad signal? With VoLTE (voice over LTE) and VoWiFi (voice over Wi-Fi), these problems are a thing of the past. Xiaomi smartphones support both functions, but by default they are often turned off - and in vain!

The inclusion of voice calls over the Internet gives several advantages:

• 📶 A stable signal even where normal cellular communication is not catching (for example, in basements or dense forests).
• 🎙️ Pure sound in format HD-voice (broadband audio codec), as if the interlocutor is next to the.
• ⚡ Instant connection – no delay in dialing, like in old networks 2G/3G.
• 💰 Battery savings as phone doesn’t switch between networks 4G and 3G during conversation.

However, there are nuances: not all operators support these technologies, and on some Xiaomi models (especially budget) functions can be hidden in the depth of settings. In this article, we will discuss how to enable voice calls on any smartphone of the brand – from the flagship Mi 13 Ultra to the budget Redmi Note 12.

Verify VoLTE and VoWiFi support for your Xiaomi

Before you set up, make sure your smartphone and SIM-The map is supported by technology. Here are 3 key conditions:

1. Almost all Xiaomi models released after 2018 support VoLTE, with the exception of some low-end models for the African/Indian markets (e.g. the Redmi 9A in the Nigerian version).
2. In Russia, VoLTE officially work at MTS, Beeline, MegaFon and Tele2, but the coverage is different. VoWiFi is supported only by MTS and MegaFon (2026).
3. Firmware. On custom firmware (like LineageOS), the functions may not work. It requires an official MIUI version 12 and later.

To check the hardware support:

1. Open the Settings app → About the phone → All the characteristics.
2. In the Network section, look for the VoLTE or IP Multimedia Subsystem (IMS) strings.
3. If they don’t, your model doesn’t support the technology.

Step-by-step: how to enable VoLTE on Xiaomi

If your smartphone and carrier support the technology, follow this instruction. Importantly, before setting up, reboot your phone, it will reset temporary network errors.

Make sure that SIM-card activated|Connect to the network 4G/LTE|Update MIUI last-minute|Reboot the phone-->

Steps for activation:

1. Open the Settings. → SIM-maps and mobile networks.
2. Choose yours. SIM-card (if there are several).
3. Tap on the network type and install 4G (recommended).
4. Go back and find Voice Calls (or VoLTE).
5. Activate the switch Enable VoLTE (on some models it is called Improved Calls).
6. Confirm the action if a request appears.

After turning on the status bar (top right corner of the screen), an HD or VoLTE icon will appear when making a call. If the icon is not available but the function is on, don't worry: some operators won't display it.

⚠️ Note: On the Redmi Note 8 Pro and older models, the VoLTE option may not be on the menu.In this case, manual activation via the engineering menu is required (instruction below).

If after activating VoLTE calls do not pass:

• 🔄 Reboot the phone.
• 📶 Manually select the operator network in Settings → Mobile network → Network operators.
• 📱 Update the firmware through Settings → Updating the system.
• 💳 Check that SIM-The card supports VoLTE (check with the operator).

💡

If after activation of VoLTE mobile Internet disappeared, disable the function and contact the operator – perhaps the problem in the settings of APN.

Activation of VoWiFi (Calls over Wi-Fi) on Xiaomi

VoWiFi technology allows you to call even without cellular network coverage using home or office Wi-Fi. This is a salvation for basements where the operator’s signal is not caught. However, in Russia, VoWiFi is officially supported only by MTS and MegaFon (2026).

To turn on VoWiFi:

1. Connect to a stable Wi-Fi network.
2. Go to Settings. → SIM-maps and mobile networks.
3. Choose yours. SIM-map.
4. Find Calls via Wi-Fi (or VoWiFi) and activate it.
5. Accept the operator's terms if a request arises.

After turning on in the status bar, a Wi-Fi icon with a tube will appear (📞 If it's not there, but the function is enabled:

• Check if your carrier supports VoWiFi (list above).
• Make sure that the Wi-Fi router does not block UDP-port 500 (necessary for the IMS).
• Turn off the VPN – it may interfere with the connection.

⚠️ Note: Some Xiaomi firmware (especially global ones) have a hidden VoWiFi option, and to unlock it, you need to change your phone region to India or Europe via Settings. → Additionally. → Region. After changing region, restart the device.

Manual VoLTE enablement via engineering menu (for older models)

If your Xiaomi doesn’t have VoLTE in its settings, but the model supports it (see table above), you can activate the feature via an engineering menu.This method works on Redmi Note 8/9, Mi A2/A3 and other Android 9-11-based firmware devices.

Instructions:

1. Open the phone app and dial the combination: ##4636##
2. In the menu that opens, 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 switch – activate it.
6. Reboot the phone.

If after these actions, VoLTE does not work:

• 🔧 Check what's in the Settings → Mobile network → Access point (APN) The correct operator profile is installed (usually loaded automatically).
• 📋 Make sure that the engineering menu is in the section IMS Service Status is worth Registered.
• 🔄 Reset network settings: Settings → System system → Reset → Resetting network settings.

💡

If after manual activation of VoLTE, mobile data stopped working, return the network settings to their original state through Settings → Mobile Network → Reset settings.

Solving the Problem: Why Internet Voice Calls Are Not Working

Even after the right setup VoLTE/VoWiFi There may be failures.-5 causes and ways of eliminating them:

If none of these methods helped, check:

• 📱 Firmware Updates: Go to Settings → Update the system once a week.
• 📡 Network coverage: VoLTE requires stable 4G-signal (minimum) 2-3 «stick).
• 🔒 Security settings: Some antiviruses (e.g. Avast) block IMS-linkage.

You can use the hidden menu ##4636### (IMS Status section) to diagnose the problem, if it's Not Registered, you can contact support.

Comparison of VoLTE and VoWiFi: which is better to choose

Both technologies have the same goal, which is to improve the quality of calls, but they work differently.

When to use VoLTE:

• 🚗 You often move around the city and want a stable connection.
• 📶 You have good coverage. 4G, but weak signal 3G/2G.
• 🔋 It is important to save battery power.

When to choose VoWiFi:

• 🏠 You often call from a home/office with a poor mobile signal.
• 🌍 Traveling abroad and want to avoid roaming.
• 🎮 Playing online games and talking at the same time (VoWiFi does not steal traffic) 4G).

💡

On most Xiaomi smartphones, you can use VoLTE and VoWiFi simultaneously. The phone will automatically select the best communication channel.

FAQ: Answers to Frequent Questions