Wi-Fi Calls on Xiaomi: How to Turn on VoWiFi in 5 Minutes

Are you tired of communication interruptions in a basement or office with poor mobile coverage? VoWiFi (Voice over Wi-Fi) technology allows you to make calls over the Internet using a stable connection to the router. On Xiaomi smartphones, this feature has been available for several years, but many users do not even know it exists – or face problems when setting up.

In this article, we will analyze not only the standard way to enable calls over Wi-Fi, but also hidden nuances: from checking support by the operator to manually adding. APN You'll learn why a feature might not appear in settings, how to make it work on older models, and what to do if calls don't pass. MIUI 14/15 and relevant to Android 12-14.

What is VoWiFi and why is it needed in Xiaomi?

VoWiFi (Voice over Wi-Fi) is a technology that allows voice calls to be made over a network connection instead of a traditional mobile network, and is especially useful in areas with poor coverage. 4G/5G, for example:

• 🏢 In office buildings with thick walls
• 🏠 In the basements or on the lower floors of apartment buildings
• 🌳 In the cottages and cottage villages
• 🛍️ In shopping malls with overloaded honeycombs

The main advantages of VoWiFi on Xiaomi:

• 📶 A stable signal even if there is no operator network
• 🔊 Better sound quality thanks to codec HD Voice
• 🔄 Smooth transition between Wi-Fi and mobile network during a conversation
• 💰 Battery savings – the phone does not waste energy searching the network

It is important to understand that VoWiFi is not the same as messengers like WhatsApp or Viber. Calls pass through your mobile operator (MTS, Beeline, MegaFon, Tele2), so:

• ✅ Your real phone number is saved.
• ✅ All standard functions (voice mail, waiting for a call) work)
• ✅ No need to install additional applications

Verify VoWiFi support for your Xiaomi and operator

Before you try to enable the feature, make sure your device and SIM card support the technology. Here are the minimum requirements for Xiaomi:

Critical information: On some models (e.g. Redmi) 9A/9C old POCO M3) VoWiFi can be locked at the firmware level even if the operator supports it, in which case only flashing to the global version will help. MIUI Or custom firmware like Pixel Experience.

To check the support of the operator:

1. Open the Settings. → SIM cards and mobile networks
2. Select your SIM card.
3. See if there are calls over Wi-Fi or VoWiFi
4. If there is no item, call the operator and check for support (codes for quick checks: *111*54# for MTS, *506# for MegaFon)

Step-by-step: how to turn on VoWiFi on Xiaomi

If your smartphone and carrier support the technology, follow this instruction.The process may vary slightly depending on the version. MIUI, But the overall pattern is the same:

Connect to a stable Wi-Fi network|Make sure that the SIM card supports VoLTE|Update. MIUI last-minute|Check the balance (some operators block the function when the balance is negative)-->

The main activation route:

1. Open the settings (cog icon)
2. Go to SIM cards and mobile networks
3. Choose your SIM card (if there are several)
4. Tap on Wi-Fi (or VoWiFi) calls
5. Switch the slider to the position on.
6. Select mode: Wi-Fi only - calls only over the Internet Wi-Fi is preferable - first tries Wi-Fi, then mobile network Mobile network preferable - Wi-Fi is used only if there is no coverage

After turning on next to the network indicator, an icon will appear in the status bar 📞Wi-Fi or VoWiFi. If you don't have a badge, reboot your phone.

For some models (POCO F3, Xiaomi 11T) Additional adjustments may be required APN:

1. Go to Settings. → SIM cards and mobile networks → Access points (APN)
2. Select your SIM card.
3. Click on the current profile APN
4. In the field, Tip. APN Add a comma to the,ims
5. Save the changes and restart the phone

💡

If after turning on VoWiFi mobile data stopped working, check the settings APN. Sometimes operators require a separate profile to VoLTE/VoWiFi.

Problem Solving: VoWiFi is not turned on or not working

If you followed the instructions but the function is not activated, here are the common reasons and ways to eliminate them:

To diagnose problems, use the hidden engineering menu:

1. Open the phone application
2. Enter the code ##4636##
3. Go to Phone Information
4. Scroll down to the VoWiFi block
5. Check status: Enabled is active, Disabled is disabled

💡

On the Redmi Note 8 Pro and older models, VoWiFi is officially not supported due to an outdated modem. However, some users successfully activate the feature through custom firmware based on Android 11.+.

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

Even if VoWiFi works, the quality of the connection may be poor, and here are some proven optimizations:

1. Use 5 GHz Wi-Fi: The 5 GHz network is less busy and provides a more stable connection. Switch to the router settings.
2. Turn off traffic savings: In Wi-Fi settings (Settings) → Wi-Fi → Additionally) disable the option to save traffic.
3. Configure QoS on the router: In the router control panel (192.168.0.1 or 192.168.1.1), turn on Quality of Service (QoS) and prioritize voice traffic.
4. Update the router's firmware: Outdated router software may cause delays. Check the updates on the manufacturer's website.

For advanced users, there are hidden settings available through the engineering menu:

• Enter ##4636## → Phone information
• Scroll to Wi-Fi Calling
• Configure the settings: Wi-Fi Calling Mode: Select EPDG (for better compatibility) IMS Registration Status: Registered VoWiFi Capability: Enabled

If the sound quality is poor, try alternative codeki:

• 📞 In Call Settings (Settings) → Annexes → Phone. → Calls) select Codecs
• 🔊 Give preference EVS Opus instead of the standard AMR

VoWiFi and roaming: important nuances

When using VoWiFi in roaming, there are a few critical points that are worth knowing:

⚠️ Note: Some operators (e.g. Tele2) block VoWiFi on international roaming, even if the feature is running on a home network.

Rules for using VoWiFi in roaming:

• 🌍 Roaming Wi-Fi calls can be charged as international even if you’re connected to your local Wi-Fi
• 📡 Some countries (e.g. USA, Japan) require local registration. IMS, can block the function
• 🔒 EU has uniform roaming rules, but VoWiFi may not work well due to different carrier standards

How to check the charging of VoWiFi in roaming:

1. Call a short operator number (e.g. 0890 for MTS)
2. Clarify rates for calls over Wi-Fi in roaming
3. Ask to activate the Wi-Fi Calling Roaming option (if available)

If VoWiFi does not work in roaming, but you need a stable connection:

• 📲 Use messengers (WhatsApp, Telegram) for calls
• 🔄 Buy a local. SIM-support-card VoLTE/VoWiFi
• 📶 Enable data roaming and use the mobile network (but it's more expensive)

FAQ: Frequent questions about VoWiFi on Xiaomi