VoWiFi on Xiaomi phone: what it is, how it works and why you need it

Why VoWiFi is Important in 2026

Have you ever noticed how the call suddenly stops when you walk into the basement or the elevator? Or how the voice of the interlocutor turns into a robot on the subway? VoWiFi is a technology that solves these problems once and for all. In Xiaomi smartphones, it appeared several years ago, but still many users either do not know about its existence or are afraid to turn on because of myths about "intercept calls" or "fast battery discharge."

Voice over Wi-Fi is actually a standardized protocol that allows you to call and send SMS over a wireless network, not just over a cellular network. This is especially true for Xiaomi, where the brand is pushing budget models with VoWiFi, making the technology available to millions of users. But how does it work in practice? And why carriers don't always support it? Let's take a look at the order of things, from theory to step-by-step settings.

What is VoWiFi and how is it different from VoLTE?

Many people confuse VoWiFi with VoLTE (voice over 4G), but these are two different technologies with a common purpose: improving communication quality. VoLTE works over a 4G/5G mobile network, and VoWiFi uses Wi-Fi networks, including home routers, public hotspots and even corporate networks.

• 📶 VoLTE depends on the coverage of the mobile operator. If the signal is weak, the call will be interrupted.
• 📶 VoWiFi connects to the nearest Wi-Fi point even if there is no cellular network, such as in the basement or outside the city where there is only Wi-Fi from the router.
• 🔋 VoWiFi can save battery life, as it does not require constant cell tower search.
• 🌍 VoLTE only works in the area of operation 4G/5G, VoWiFi is everywhere where the Internet is available (even through the Internet). VPN).

It's important to understand that VoWiFi is not a replacement for VoLTE, but a complement to it. Ideally, a smartphone should support both technologies and automatically switch between them. For example, if you start a conversation at home over Wi-Fi and then go outside, the call will smoothly switch to VoLTE without a cliff.

What Xiaomi models support VoWiFi (full list 2026)

Not all Xiaomi smartphones are equipped with VoWiFi hardware support. The technology requires a special chip and firmware with support for IMS (IP Multimedia Subsystem). Below is the current list of models that officially support the function (tested on MIUI 14/15 and HyperOS):

Important: even if your model is on the list, VoWiFi may not work if the carrier does not support the technology. For example, in Russia, VoWiFi is actively promoted by MTS, Beeline and Tele2, and MegaFon supports it selectively. In Ukraine, Kyivstar and vodafone offer the feature, in Kazakhstan - Kcell and Beeline KZ.

How to turn on VoWiFi on Xiaomi: step-by-step instructions

If your smartphone and carrier support VoWiFi, you can turn it on for a short time. 2-3 The instructions are relevant to MIUI 14/15 HyperOS:

1. Open Settings → SIM cards and mobile networks.
2. Choose yours. SIM-card (if two of them).
3. Calls over Wi-Fi (or VoWiFi).
4. Switch the slider to the position on.
5. Select the mode of operation: 📞 Wi-Fi only – Wi-Fi only calls (not recommended). 📶 Wi-Fi is preferred - priority is given to Wi-Fi, but in its absence, a cellular network is used. ⚖️ Automatically – the smartphone itself chooses the best option.

Confirm the activation by following the instructions on the screen (reboot may be required).

Turn off the mobile Internet (on the plane mode with Wi-Fi enabled)

Call another number – the call must go through Wi-Fi

Check the Wi-Fi Calling icon in the status bar

Make sure the voice of the interlocutor is clear, without interference.

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⚠️ Warning: If VoWiFi calls fail after activation, check:

1. Are you connected to Wi-Fi (even if you have mobile internet). 2. Does your carrier support VoWiFi (list above). 3. Does the router block ports for IMS (UDP port 5060 should be open) 4. Is the smartphone firmware updated to the latest version?

Common VoWiFi Problems and How to Solve Them

VoWiFi is a reliable technology, but sometimes users encounter errors, and here are the most common ones and ways to fix them:

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

1. Go to Settings → System and device → Resetting.
2. Select Network Resetting.
3. Confirm the action and restart the smartphone.

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If VoWiFi is unstable, try manually specifying the DNS-Google servers (8.8.8.8 and 8.8.4.4) in Wi-Fi settings, which helps 30% of the time with problem routers.

VoWiFi vs. Messengers: What is better for calls

Many people ask, "Why do you need VoWiFi if you have WhatsApp, Telegram or Viber?"

• 📱 VoWiFi: Works with regular phone numbers (no need to install apps) and supports emergency calls (112, 911) regardless of the battery charge of the messenger.
• 💬 Messengers: require both partners to install the app, can be blocked in some countries (e.g. WhatsApp in China), do not support calls to landlines.

When to use VoWiFi:

• 🏢 In the office with corporate Wi-Fi (calls through messengers can be blocked).
• 🚇 In subways or underground parking lots where there is no cell phone.
• 🆘 For emergency calls (they don't take calls via WhatsApp!).

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VoWiFi is not a replacement for messengers, it's an add-on, and it's a reliable connection in all environments, even when the Internet is off or messengers are blocked.

VoWiFi Security: Myths and Reality

One of the biggest fears of users is, "Can I listen to calls over VoWiFi?"

Myth 1: “VoWiFi is less secure than regular calls.”

The reality: VoWiFi uses the same encryption protocols (SRTP and IPSec), which is VoLTE. Data is transmitted in encrypted form, and authentication is done through SIM-It's no easier to listen to a call like that than a regular call.

Myth 2: “Wi-Fi calls can be intercepted over public networks.”

Reality: Yes, in theory, a hacker could try to intercept traffic on an open Wi-Fi network (such as a cafe) but to do so, he needs to:

• 🔓 Hack encryption. IMS (hard-won).
• 🎯 Targeting your call specifically.
• ⏱️ Do it in a few seconds (no calls are stored on servers).

⚠️ The only real risk is connecting to fake Wi-Fi networks (e.g., the wi-fi network, "Free_WiFi_Starbucks", In this case, the attackers can reroute your traffic to avoid it:

1. Do not connect to open networks without a password. 2. Use a VPN (such as Cloudflare WARP or ProtonVPN). 3. In VoWiFi settings, choose Wi-Fi mode preferably, not just Wi-Fi.

FAQ: Answers to Frequent Questions about VoWiFi in Xiaomi