Xiaomi Wi-Fi Call: Detailed Guide 2026

If you're a Xiaomi smartphone owner and you notice the Wi-Fi call option in your settings, but you don't understand what it is and why it's necessary, this article is for you. The technology allows you to call over the Internet instead of a cellular network, which is especially useful in areas with poor coverage of mobile operators. But how it works on Xiaomi devices, which models support the feature, and why calls sometimes don't pass? We'll go through all the nuances, including hidden MIUI settings, compatibility with Russian carriers and ways to fix typical errors.

Importantly, Wi-Fi calling is not the same as messaging apps like WhatsApp or Telegram, but it's about standard phone calls over a number. SIM-maps but transmitted over an Internet channel. MIUI It requires support from a telecom operator, and in 2026, Beeline, MegaFon and Tele2 are actively implementing it, but there are important limitations, which we will discuss below.

What is a Wi-Fi call on Xiaomi and how does it work

Wi-Fi Calling (or Wi-Fi Calling) is a technology that allows voice calls and SMS over the Internet, bypassing traditional cell towers. On Xiaomi smartphones, the feature works according to the IMS (IP Multimedia Subsystem), which provides voice in digital format, the main advantage is a stable connection even where the 2G/4G signal is weak or absent at all (for example, in basements, elevators or country houses).

How this works in practice:

• 📶 The smartphone connects to any Wi-Fi network (home, office or public).
• 🔄 If the cellular signal is weak, calls automatically switch to Wi-Fi (when the function is turned on).
• 📞 At the other end, the caller sees your normal number, just like a standard call.
• 💰 Payment is at the rate of the mobile operator (not Wi-Fi traffic!).

A critical nuance for Xiaomi: the function works only with the SIM-In 2026, it is Beeline, MegaFon and Tele2 (MTS has the technology in test mode), even if your Redmi or POCO Technically supports the function, without the appropriate operator tariff it will be inactive.

What Xiaomi models support Wi-Fi Calling

The Wi-Fi call feature is not available on all Xiaomi devices, and it depends on two factors: hardware support (chipset) and the MIUI firmware version. Below is a table with the current data for 2026:

⚠️ Note: On budget models (Redmi) 10A, POCO M4) The function may not be available even when upgrading to the latest version. MIUI. Check support through the Settings menu → SIM-maps and mobile networks → Wi-Fi call. If you don't have a point, your device is not compatible.

Also, keep in mind that for Wi-Fi Calling to work, you need:

• 🔄 Update your firmware to the latest stable version (check in Settings) → The phone. → Updating the system).
• 📱 Use the original firmware MIUI (custom-made ROM LineageOS function may not work).
• 🔒 Activate the service from the operator (sometimes you need to send a service) USSD-team-up).

How to enable a Wi-Fi call on Xiaomi: step-by-step instructions

If your device supports the function, you can activate it in 3 steps. The instructions are universal for all compatible models Xiaomi, Redmi and POCO:

1. Open Settings and go to the section SIM-maps and mobile networks.
2. Choose yours. SIM-card (if there are several).
3. Slip on the Wi-Fi call item and move the slider to the "On" position.
4. Confirm the activation if you request to download the IMS configuration.

After activation, an icon will appear in the status bar 📞Wi-Fi (or "Wi-Fi Calling"). If it's not, check it out:

Are you connected to a Wi-Fi network?|

Is mobile data enabled (even if you call on Wi-Fi)|

Does your operator support the function (the list of tariffs below)|

Is the firmware updated to the latest version?-->

🔧 Hidden life hack: On some models (e.g. Xiaomi) 12T) To unlock it, type in the Phone app code ##4636##, then go to Phone Information. → Wi-Fi Calling and select "On" mode.».

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If the call does not go through after the function is turned on, try restarting your smartphone or resetting your network settings to Settings → Connections → Resetting your network settings.

Wi-Fi Calling vs VoLTE: What’s the difference and what’s better

Many people confuse Wi-Fi Calling and VoLTE (voice over 4G), but these are two different technologies with different use cases.

🔹 When to use Wi-Fi Calling:

• 🏠 Home or office with poor mobile network signal.
• 🚇 In subways, basements, elevators (where there is no coverage) 4G).
• 🌍 Abroad (roaming savings if connected to local Wi-Fi).

🔹 When is VoLTE better:

• 🚗 In motion (switching between towers is smoother than between Wi-Fi points).
• 📶 In the great zones 4G-coating (less delays).
• 🔋 With a discharged battery (VoLTE optimized for energy saving).

Important: on Xiaomi, both technologies can work simultaneously, for example, if you start a call over Wi-Fi and leave the network coverage area, the call will automatically switch to VoLTE (with operator support).

Wi-Fi Calling Issues on Xiaomi and How to Solve Them

Even if the feature is enabled, users often encounter errors, and consider typical problems and ways to fix them:

1.The Wi-Fi Calling icon is there, but calls don't pass

• 🔄 Solution: Check if your plan supports the function. For example, Beeline only has Wi-Fi Calling available on "It's Easy," "No Limit" and corporate rates. MegaFon has it on "All Mine" and "Enable!».
• 📱 Solution: Update the operator's service profile: ##869434## → «Update».

2. function of gray and not included

• 🔧 Solution: Reset network settings: Settings → Connections → Resetting network settings.
• 🔄 Solution: Insert SIM-slot 1 card (on some models slot 2 does not support) IMS).

3. Calls are terminated when switching between Wi-Fi and 4G

• 📶 Solution: Turn off the option “Switch to mobile network” in the Wi-Fi Calling settings.
• 🔋 Solution: Activate Maximum Performance Mode in Settings → Battery.

⚠️ If after all the manipulations the function did not work, check whether the operator blocked the function. IMS-services for your room. This is relevant for corporate SIM-Call the operator and check if the service is enabled "Wi-Fi Calling" for your number.

Hidden settings Wi-Fi Calling on Xiaomi: engineering menu

For power users who want to fine-tune Wi-Fi Calling, MIUI has hidden settings, which are accessed through the engineering menu:

1. Open the Phone app and enter the code ##4636##.
2. Go to the phone information section.
3. Scroll down to the Wi-Fi Calling block and tap it.

Options are available here:

• 🔄 IMS Registration Status – Registration Status IMS (It must be "Registered»).
• 📞 Wi-Fi Calling Preference – a priority for Wi-Fi or cellular networks.
• 🔒 EPDG Settings – Connection security settings (don’t change without needing to!).

⚠️ Attention: Changing the settings in the engineering menu can cause communication failures. If you are not sure of the actions, it is better to leave the default settings. For example, forced VoWiFi on an incompatible device will lead to a lack of network.

🔧 Useful trick: If the status of the engineering menu IMS shows “Not Registered”, try to manually update the configuration by clicking Update IMS. Sometimes this solves the connection problem.

The future of Wi-Fi Calling on Xiaomi: what to expect in 2026-2026

In 2026, Xiaomi is actively implementing improvements to Wi-Fi Calling in new firmware.

• 🆕 Support 5G + Wi-Fi Calling: Working with fifth-generation networks for even more stable connectivity.
• 🔄 Automatic Switching: Smooth Switch between Wi-Fi, 4G and 5G callless (technology) IMS Handover).
• 📱 Expanding the list of models: The appearance of a feature on budget smartphones (Redmi) 13C, POCO M6).
• 🌍 Global roaming: The ability to call over Wi-Fi abroad without additional settings.

MIUI 15 (expected to be released in autumn 2026) also promises to add:

• 🔒 Improved protection: Encrypting Wi-Fi calls to the standard SRTP.
• 📊 Call statistics: Display how many calls have been made over Wi-Fi and how many over the cellular network.

🔮 By 2026, Wi-Fi Calling will become a standard feature on all Xiaomi smartphones costing from 15,000 rubles.

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If your Xiaomi smartphone is released after 2022, it most likely supports Wi-Fi Calling – all that remains is to turn on the feature and check the tariff with the operator.

FAQ: Frequent questions about Wi-Fi Calling on Xiaomi