How to Enable Wi-Fi Calling on Xiaomi: A Complete Guide

Modern smartphones from Xiaomi And Redmi have a wide range of functionality that is often hidden deep within system settings. One of the most useful, but not always obvious, features is Wi-Fi Calling, which allows voice calls to be made over the internet when cellular signal is weak or absent. This technology, also known as VoWiFi, is a lifesaver for residents of country houses, offices with thick walls, or spaces with poor network coverage.

Many users encounter the problem that after enabling an option in the phone menu, it does not start working, or the activation option itself is simply missing. Problem Often, the problem isn't rooted in the device's hardware, but in carrier settings or specific MIUI and HyperOS firmware requirements. In this article, we'll detail how to activate this feature, which carriers support the technology in Russia and the CIS, and how to bypass restrictions if the standard method doesn't work.

Before setting up, it's important to understand that call quality directly depends on the stability of your wireless connection. If your router is overloaded or the signal is weak, the technology may not activate automatically, even if all settings are correct. The key requirement is that your tariff plan supports the service and you have an active SIM card with data roaming enabled (in some cases).

What is VoWiFi and why do Xiaomi owners need it?

Technology Voice over Wi-Fi (VoWiFi) allows voice traffic to be transmitted over the Internet protocol, bypassing standard cellular data channels. To the user, it appears like a regular call, but a special icon, often depicted as a telephone handset with a Wi-Fi symbol, appears in the status bar next to the signal strength. The main advantage is the ability to stay connected in areas where cellular coverage is poor but wireless internet is available.

Smartphone owners Xiaomi And POCO receive additional bonuses thanks to system optimization MIUI and new HyperOSThe system can intelligently switch between Wi-Fi and LTE/5G during a call without interrupting the connection. This is especially useful when moving from a building to the street or an elevator, where the base station signal may be lost.

• 📞 Perfect sound quality: HD voice is transmitted with less distortion than in a standard 2G/3G network.
• 🏠 Coverage in "dead zones": The ability to make calls from basements, deep offices, or remote summer cottages.
• 💰 Roaming savings: While abroad, you can receive calls as if you were within the country if you are connected to Wi-Fi (rates vary depending on your operator's terms).

⚠️ Please note: This feature may not work if the SIM card does not have the correct APN settings or if your carrier is temporarily performing maintenance on their equipment.

It's worth noting that not all phone models support this feature at the software level, although most devices released after 2018 already have the necessary modules. It's also important that your device's firmware isn't the Chinese Global version (CN Global), as it may lack local carrier profiles.

Checking operator and tariff compatibility

The first step before delving into your phone's settings should be checking whether your carrier supports the service. In Russia and the CIS, major market players have long since implemented VoWiFi, but activation requirements may vary. For example, some carriers activate the service automatically, while others require a USSD command or activation in your account.

Let's look at the main requirements of popular operators for the technology to work on devices Xiaomi:

• 📱 MTS: The MTS Wi-Fi Calling service must be active. On some plans, it's enabled by default, while on others, it requires activation through the My MTS app.
• 🟡 Beeline: Activation of the "Wi-Fi Calling" service is required. It's important to have data roaming enabled in your phone settings, even when you're at home.
• 🟢 Megaphone: The Wi-Fi Calling feature often requires a network profile update. Check the status in the Megafon app.
• 🔴 Tele2: The Wi-Fi Calling service may require manual activation via a code or the operator's website.

Users often forget that for VoWiFi to work correctly, it must be enabled in the mobile network settings. data roamingThis is necessary for proper device authorization in the operator's network when switching voice channels. Without this option, calls may simply not initiate over Wi-Fi.

It's also worth keeping in mind that mobile virtual operators (MVNOs) operating on the Big Four networks (e.g., Yota, SberMobile, Tinkoff) inherit the settings of the underlying carrier. However, if you use a corporate SIM card, the network administrator may have blocked the use of alternative communication channels.

Basic Wi-Fi Calling Setup on Xiaomi and Redmi

If your operator has confirmed support for the service, you can proceed to setting up the smartphone itself. Interface MIUI And HyperOS The process may vary slightly depending on your Android version, but the logic remains the same. First, make sure the feature is unlocked in the hidden or main menu.

Please follow these steps to activate:

1. Open the default application Telephone (green handset) through which you make calls.
2. Click on the three dots in the upper right corner or the menu button, then select Settings.
3. In the list that opens, find the section Accounts or just one point Calls via Wi-Fi.
4. Move the switch to the active position.

An alternative way is through the general system settings. Go to Settings → Connection and sharing → Mobile networkThere should be a switch here. Wi-Fi callingIf you don't see this option, it may be hidden or not supported by your current SIM card configuration.

After turning on the switch, the system may prompt you to enter your emergency services address (E911), especially on global firmware versions. Enter your address, even if you're not at your registered address—this is a technical requirement of the protocol. After saving the status, the bar should appear in the status bar.

Hidden settings and engineering menu

In some cases, especially on devices with global firmware but Chinese hardware, or on older models, the menu item may be missing. This is where the engineering menu comes in handy. Xiaomi, which allows you to control hidden radio module parameters. Be careful: changing unknown parameters may result in unstable communication.

To access advanced settings, use the code in the dialer app:

##869434##

In the menu that opens MiWifiCalling select an option Disable (which means disabling the lock, that is, enabling the function) or Enable, depending on the logic of your menu version. After running the command, reboot your device. If the code doesn't work, try an alternative approach through developer settings.

⚠️ Note: The engineering menu interface may differ on different Android versions. If you are unsure of what you're doing, it's best not to change any settings labeled "Debug" or "Test."

Another method is activation via ADB (Android Debug Bridge), if you have access to a computer. This command allows you to force-enable the VoWiFi support flag in the system registry:

adb shell settings put global carrier_volte_available 1
adb shell settings put global carrier_wfc_ims_available 1

This method requires USB debugging mode enabled and ADB drivers installed on the PC. It is effective for advanced users who want to unlock hidden features of their device. Redmi Note or Mi smartphone.

Troubleshooting: Icon not appearing or calls not making progress

Even after all these steps, the Wi-Fi Calling icon may not appear, or calls may be dropped. The most common cause is an APN profile conflict. Carriers use special access points to route voice traffic, and if the phone has an "empty" or incorrect profile, the connection will fail.

Check your access point (APN) settings:

• 🔍 Name: Must match the operator (for example, internet.mts.ru).
• ⚙️ APN Type: Make sure the type is selected default,supl,mms or ims.
• 🔄 Reset: In the hotspots menu, tap the menu (three dots) and select Restore to default.

The problem could also be related to antivirus software or VPN services. Since VoWiFi requires a direct connection to the operator's servers, any programs that change the IP address or filter traffic can block the establishment of a secure channel. Try temporarily disabling the VPN and testing the feature.

If all else fails, try deleting the SIM card profile from the system and adding it again. Sometimes the network settings cache may contain errors that prevent proper registration with the operator's IMS network.

Features of working on different versions of MIUI and HyperOS

shell MIUI It has many versions: Global, EU, China, and Russia. Chinese (CN) versions often lack pre-installed profiles for European or Russian operators, obscuring the menu option. In such cases, changing the region in the phone settings helps.

Go to Settings → Additionally → Region. Try installing India, Indonesia or SingaporeVoWiFi technology is widely available in these regions, and the system may unlock the corresponding settings for your SIM card. After changing the region, restart your device.

Why doesn't it work on custom firmware?

Custom builds (LineageOS, Pixel Experience) often lack Xiaomi's proprietary blobs required for IMS. Without them, VoWiFi may not work even with kernel support.

In the new operating system HyperOS The menu structure has been changed. Communication controls are now located in the section Mobile network within the general settings, not in the phone app. We've also added a "Smart Switching" feature that analyzes signal quality and automatically decides when to switch calls to Wi-Fi.

The impact of a router and network quality on voice communications

It's important to remember that Wi-Fi Calling is extremely sensitive to latency (ping) and jitter. If your router is overloaded with torrents or 4K streams, voice quality will degrade, resulting in robotic sounds or interruptions. This technology requires a stable connection with voice traffic prioritized.

Recommendations for network optimization for VoWiFi:

• 📶 5 GHz band: Use 5GHz instead of 2.4GHz for less interference.
• 🚀 QoS: Enable Quality of Service in your router settings and set priority for your phone.
• 📏 Distance: Stay closer to the access point for a confident signal reception (-60 dBm and better).

Modern routers that support the standard Wi-Fi 6 (802.11ax) handle multiple connected devices better, which improves call stability. If you have an older router, manufactured more than seven years ago, it may not be able to encrypt voice traffic in real time.

Is it safe to use Wi-Fi Calling on public networks?

Yes, VoWiFi traffic is encrypted by the telecom operator (IPSec protocols), so even on open networks like cafes or airports, your conversations are protected from eavesdropping. However, it's recommended to avoid suspicious networks without a password.

Does Wi-Fi Calling reduce battery life?

In most cases, power consumption is comparable to normal standby mode. However, when the Wi-Fi signal is very weak, the phone's module works more intensively, which can drain the battery faster.

Is it possible to make calls via Wi-Fi abroad?

Yes, this is one of the best ways to avoid roaming charges. You call Russian numbers as if you were calling from within Russia. However, incoming calls may be charged as if you were roaming; check with your operator for details.

Why does the Wi-Fi Calling icon disappear when there is an incoming call?

This may mean that the network quality dropped below the threshold when connecting, and the phone attempted to switch to LTE. If LTE isn't available either, the call may be dropped.

Does the function work on two SIM cards simultaneously?

Technically supported, but typically only one SIM card is active for Wi-Fi calls at a time, or the setting is applied globally to the device if the carriers are the same.