Wi-Fi Calls on Xiaomi: How to Turn on VoWiFi and Why It Doesn't Work

Wi-Fi (VoWiFi) calls on Xiaomi smartphones are technology that allows you to make and receive calls even when you don’t have a mobile network using an Internet connection. The feature is especially useful in areas with poor operator coverage: basements, remote areas or outside the city where the 4G/5G signal is unstable. However, not all Xiaomi models support VoWiFi, and the setting is often hidden in deep menus or depends on firmware.

In this article, you’ll find step-by-step instructions for activating Wi-Fi calls on different Xiaomi models (including the Redmi Note 12, POCO X5, Mi 13, and others), figure out why the feature may not work, and learn how to check its availability with your carrier. We also tested VoWiFi on MIUI 14 firmware and HyperOS — the results in the table below.

Which Xiaomi smartphones support Wi-Fi (VoWiFi) calls?

VoWiFi (Voice over Wi-Fi) technology is not available on all Xiaomi devices, and support for it depends on three factors:

• 📱 Smartphone model – the chipset must support the standard (e.g., Snapdragon 8 Gen 2 or Dimensity 9000)+).
• 📡 The Firmware – The function appeared in MIUI 12.5, but only works with stable MIUI 14 and HyperOS.
• 🏢 Telecom operator – not all providers in Russia and CIS support VoWiFi (list below).

Here is the official list of Xiaomi models with VoWiFi support (as of 2026):

Important: even if your model is on the list, the function can be disabled by the operator. For example, Tele2 and Iota do not support VoWiFi in Russia, and MTS and Beeline require special services. SIM-map (USIM).

How to enable calls via Wi-Fi on Xiaomi: step-by-step instructions

If your smartphone and carrier support VoWiFi, you can activate the function in 2-3 minutes. MIUI 14 and HyperOS:

1. 📶 Connect to Wi-Fi – make sure the network is stable (speeds from 5 Mbps).
2. 🔧 Open the Settings. → SIM-maps and mobile networks.
3. 📞 Choose yours. SIM-card (if two of them).
4. 🔄 Scroll down and find the item "Calls over Wi-Fi" (or VoWiFi).
5. 🔘 Switch the slider to the "On" position.".
6. 🔄 Wait for activation (reboot may be required).

If Wi-Fi Calls are not on the menu, try:

• 🔍 Update the firmware to the latest version (path: Settings) → The phone. → Updating the system).
• 📋 Insert SIM-slot-card SIM 1 (on some models, VoWiFi only works with the main card).
• 🔄 Reboot your phone and repeat the steps.

How do you know that VoWiFi is working? An icon will appear in the status bar next to the signal level. 📞Wi-Fi or VoWiFi, and when you call in the top panel, you'll see "Call over Wi-Fi".

Why are Wi-Fi calls on Xiaomi not working?

VoWiFi may not be activated or malfunction for several reasons.-5 problems and solutions:

1. In Russia, the technology is officially provided only by MTS, Beeline and MegaFon - but even they may have restrictions by region.
2. On MIUI 12 and below, VoWiFi is unstable. Update the software through Settings → Update the system.
3. Incorrect settings APN If the operator supports VoWiFi but the function is not enabled, check the access points: Settings → SIM-maps and mobile networks → Access points (APN) Make sure that you select an operator profile (not "default" or "internet").
4. Blocking by a firewall or VPN Some of them VPN-Services and antiviruses (such as Kaspersky) block VoWiFi.
5. Problems with the VoWiFi Wi-Fi router require a stable connection with a low ping. If the router is overloaded or uses an outdated protocol (e.g. 802.11b), calls will stop. Switch to the 5GHz band.

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If VoWiFi is turned on but calls don't pass, try turning off Wi-Fi Assist in Wi-Fi settings.This feature automatically switches to mobile data when the signal is weak, which can interfere with VoWiFi.

⚠️ Note: On some Xiaomi models (e.g. Redmi Note 11) VoWiFi disappears from the menu after upgrading to HyperOS. This is a firmware bug - watch for patches in the update center.

How to check if VoWiFi is working on your Xiaomi?

To make sure that calls are actually coming via Wi-Fi, rather than a mobile network, follow these steps:

1. Turn off mobile data: Go to Settings → SIM-maps and mobile networks → Mobile Internet and Deactivate the Switch.
2. Call another number: If the call passes, VoWiFi works. If it doesn't, check the settings again.
3. Use the engineering menu (for advanced ones): Enter ##4636##, select Phone Information, and look up VoWiFi status. If it's Connected, it's okay.

You can also use network testing applications like NetMonster or Network Cell Info Lite, which show which channel (Wi-Fi or LTE) voice traffic is going through.

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If VoWiFi is working but the communication quality is poor, the problem is most likely the router. Try connecting to another Wi-Fi network or restart the router.

VoWiFi vs VoLTE: What’s the Difference and Which Is Better?

Many people confuse VoWiFi (wi-fi calls) and VoLTE (4G calls), although both technologies improve communication quality, they work differently:

What to choose?

• 🏠 VoWiFi – if you make frequent calls at home or in an office with poor coverage.
• 🚗 VoLTE – if you travel a lot and need a stable connection on the way.
• 🔄 Both modes are ideal if the operator supports both.

Xiaomi can enable both functions at the same time.

1. Activate VoLTE in Settings → SIM-map → Challenge 4G (VoLTE).
2. Turn on VoWiFi (instruction above).
3. Reboot the phone.

How to improve the quality of calls over Wi-Fi on Xiaomi?

If VoWiFi is working but the voice is interrupted or interference is heard, try these optimization methods:

• 📶 Switch to 5 GHz: 5 GHz range is less prone to interference than 2.4 GHz. In router settings, select a network with a suffix _5G.
• 🔄 Update your router firmware: Outdated routers (e.g. TP-Link) TL-WR841N) You may not support modern VoIP standards. Check the updates on the manufacturer's website.
• 📵 Turn off battery savings for Phone: Go to Settings → Battery → Saving charge → Apps and add the phone to the exceptions.
• 🔊 Use a headset: With a weak Wi-Fi signal, the sound in the speaker can be distorted. Connect wired or Bluetooth headphones for better quality.

This is a common complaint on VoWiFi, and it's solved like this.

1. Turn off Voice Improvement in Call Settings.
2. Check if the hands-free mode is on at the other end of the tube.
3. Update your smartphone to the latest version.

⚠️ Warning: If the battery is quickly drained after VoWiFi activation, turn off the Wi-Fi Search function in sleep mode (Settings) → Wi-Fi → This will reduce power consumption, but may impair connection stability.

VoWiFi Alternatives: What to Do If the Feature Is Not Available

If your Xiaomi doesn’t support VoWiFi or the carrier doesn’t provide the service, there are a few ways to make calls online:

• 📱 VoIP applications: WhatsApp, Telegram, Viber and Skype allow you to call over Wi-Fi, but both interlocutors must be in the same messenger.
• 🔄 Google Fi (For Foreigners) SIM): Google’s VoWiFi service supports most Xiaomi, but requires U.S.-based VoWiFi SIM-map.
• 📞 SIP-Customers: Apps like Zoiper or Linphone let you call regular numbers through the phone SIP-account (for example, from MTS or Beeline).
• 🔧 Rooting and Modified Firmware: On Forums 4PDA There are patches for forced VoWiFi on unsupported models, but this requires unlocking the bootloader and risks voiding the warranty.

Cons of alternatives:

• 💰 Paid rates (e.g, SIP-Calls can be charged as outgoing).
• 🔒 Low reliability (VoIP applications can be blocked by firewall).
• 📶 Dependence on third-party services (if the messenger is blocked, calls will stop).

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If you get a lot of calls to a city number, get a virtual PBX service from an operator, which allows you to redirect calls to a VoIP number that will call over the Internet.

FAQ: Frequent questions about Wi-Fi calls on Xiaomi